Company lists · Data refreshed September 2026
Top 25 Constituent relations firms worldwide
RevenueBase identified 1,135 company matches for constituent relations firms worldwide as of September 2026 and tracks 9,307 professional contacts across them, including 3,751 with verified work emails. The United States is the largest market and Washington the largest hub.
This list covers company matches for constituent relations firms worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 19, 2026. Country and city lists for constituent relations firms follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest constituent relations firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 390 contacts → | ||||
Exact match “Mercury is a national bipartisan government relations and strategic communications firm.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 2 | 362 contacts → | ||||
Exact match “Somos una empresa consultora en asuntos públicos que conjunta sustancia con forma y traduce pensamiento al considerar gran diversidad de puntos de vista y panoramas.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 3 | 349 contacts → | ||||
Exact match “DKC is a full service public relations, marketing and government affairs firm and part of the Acceleration Community of Companies, Based in New York City, and with offices in Los…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 4 | 302 contacts → | ||||
Exact match “Our primary interest at FLS Connect is to understand your campaign’s mission and objective and work closely to design efforts that meet your needs.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 5 | 255 contacts → | ||||
Exact match “Cornerstone Government Affairs is a full-service, bipartisan, employee-owned firm specializing in government relations and lobbying, public affairs, strategic communications, and…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 6 | 220 contacts → | ||||
Exact match “SKDK provides strategic advice, public relations, crisis communications, advertising, direct mail, and research to national and international companies, advocacy organizations…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 7 | 179 contacts → | ||||
Exact match “Global Strategy Group is the go-to public affairs, communications, and research partner for companies, causes, and campaigns.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 8 | 166 contacts → | ||||
Exact match “Invariant is a bipartisan business advisory firm, providing strategic advice to companies, trade associations, non-profits, and individuals on how to make Washington work for them.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 9 | 97 contacts → | ||||
Exact match “Monument Advocacy is a bipartisan firm that offers government relations, public affairs, strategic and crisis communications, and digital services.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 10 | 96 contacts → | ||||
Exact match “Justice Works Youth Care is a Government Relations company located in 615 Virginia Ave, Rochester, Pennsylvania, United States.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 11 | 84 contacts → | ||||
Exact match “Founded in 1989 and independently owned by our principals, Earnscliffe operates from offices in Ottawa-Gatineau, Toronto and Vancouver.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 12 | 84 contacts → | ||||
Exact match “Founded in 1982, The Ferguson Group has a proud record of success advocating on behalf of local communities.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 13 | 77 contacts → | ||||
Exact match “Established in 1998, Sussex Strategy Group is Canada’s leading government relations, strategic communications, digital advocacy and business advisory agency.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 14 | 72 contacts → | ||||
Exact match “Larson Shannahan Slifka Group (LS2group) is a bipartisan public relations, public affairs, and marketing firm that guides its practices with one goal in mind: what others may do…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 15 | 66 contacts → | ||||
Exact match “Bose Public Affairs Group successfully advocates for our clients’ legislative, regulatory, procurement, political and communication interests with offices in Indianapolis and…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 16 | 63 contacts → | ||||
Exact match “Capitol Counsel, LLC is a full service government relations firm providing political analysis, strategic advice and advocacy services.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 17 | 62 contacts → | ||||
Exact match “GR Japan is the leading government relations and public affairs firm in Tokyo.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 18 | 57 contacts → | ||||
Exact match “We are innovators and thought leaders who believe in developing robust integrated solutions for our clients.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 19 | 55 contacts → | ||||
Exact match “At Beekeeper Group we believe in empowering people to advocate for impact by connecting them with stakeholders that are ready to take action so that our clients can achieve their…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 20 | 53 contacts → | ||||
Exact match “Smart strategy begins with being well informed.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 21 | 53 contacts → | ||||
Exact match “TRG is a government relations consulting firm located on the doorstep of the United States Capitol.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 22 | 53 contacts → | ||||
Exact match “Founded in January 2001 by Gabriel Guerra Castellanos, GC & A is a specialized consulting firm that offers strategic communication, lobbying, as well as government and community…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 23 | 50 contacts → | ||||
Exact match “Somos consultores estratégicos de asuntos públicos.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 24 | 43 contacts → | ||||
Exact match “The Livingston Group (TLG) has delivered comprehensive government relations and lobbying services in Washington DC and globally since With nine different practice areas, our…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
| 25 | 40 contacts → | ||||
Exact match “S-3 is a full service policy and government relations firm providing comprehensive solutions in government affairs and public relations to top tier clients whose priorities demand…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “constituent relations firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 1,135 constituent relations firms worldwide
See the full list, filter by size, metro and specialty, and access 3,751 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Constituent relations firms worldwide at a glance
As of Sep 19, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for constituent relations firms are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “constituent relations firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 3,751 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Constituent relations firms by location
2 lists · largest firstEvery Constituent relations firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “constituent relations firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many constituent relations firms are there worldwide?
RevenueBase identified 1,135 company matches for constituent relations firms worldwide as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Mercury Public Affairs, LLC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most constituent relations firms?
The United States leads with 752 companies, followed by Canada (46). Every constituent relations firms list by country and city is linked on this page.
Which city has the most constituent relations firms?
Washington leads with 146 company records, followed by Sacramento (22) and New York (20).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 3,751 professional contacts with verified work emails tracked across these 1,135 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.
Ready to reach these companies? Verified emails and direct dials for all 1,135 constituent relations firms worldwide. Start with a free account, no credit card.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
Company intelligence · public preview
Top 25 constituent relations firms worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 1,135 matching company records for constituent relations firms worldwide, with 9,307 tracked contacts and 3,751 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 19, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 constituent relations firms worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Mercury Public Affairs, LLCmercuryllc.comHQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 390 contacts → |
“Mercury is a national bipartisan government relations and strategic communications firm.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  CMM DE LA Calle, Madrazo, Mancera SCcmmsc.com.mxHQ: Miguel Hidalgo, MexicoReported employees: Not recorded | Miguel Hidalgo, Mexico | Not recorded | Exact match | 362 contacts → |
“Somos una empresa consultora en asuntos públicos que conjunta sustancia con forma y traduce pensamiento al considerar gran diversidad de puntos de vista y panoramas.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  DKCdkcnews.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 349 contacts → |
“DKC is a full service public relations, marketing and government affairs firm and part of the Acceleration Community of Companies, Based in New York City, and with offices in Los…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  FLS Connectflsconnect.comHQ: St Paul, MN, IndiaReported employees: 51-200 | St Paul, MN, India | 51-200 | Exact match | 302 contacts → |
“Our primary interest at FLS Connect is to understand your campaign’s mission and objective and work closely to design efforts that meet your needs.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Cornerstone Government Affairscgagroup.comHQ: Washington, DC, United StatesReported employees: 201-500 | Washington, DC, United States | 201-500 | Exact match | 255 contacts → |
“Cornerstone Government Affairs is a full-service, bipartisan, employee-owned firm specializing in government relations and lobbying, public affairs, strategic communications, and…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  SKDKskdknick.comHQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 220 contacts → |
“SKDK provides strategic advice, public relations, crisis communications, advertising, direct mail, and research to national and international companies, advocacy organizations…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Global Strategy Groupglobalstrategygroup.comHQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 179 contacts → |
“Global Strategy Group is the go-to public affairs, communications, and research partner for companies, causes, and campaigns.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Invariantinvariantgr.comHQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 166 contacts → |
“Invariant is a bipartisan business advisory firm, providing strategic advice to companies, trade associations, non-profits, and individuals on how to make Washington work for them.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Monument Advocacymonumentadvocacy.comHQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 97 contacts → |
“Monument Advocacy is a bipartisan firm that offers government relations, public affairs, strategic and crisis communications, and digital services.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Justice Works Youth Carejusticeworksyouthcare.com HQ: Rochester, PA, United StatesReported employees: 51-200 | Rochester, PA, United States | 51-200 | Exact match | 96 contacts → |
“Justice Works Youth Care is a Government Relations company located in 615 Virginia Ave, Rochester, Pennsylvania, United States.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Earnscliffe Strategiesearnscliffe.ca HQ: Ottawa, ON, CanadaReported employees: 51-200 | Ottawa, ON, Canada | 51-200 | Exact match | 84 contacts → |
“Founded in 1989 and independently owned by our principals, Earnscliffe operates from offices in Ottawa-Gatineau, Toronto and Vancouver.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  TFG The Ferguson Groupthefergusongroup.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 84 contacts → |
“Founded in 1982, The Ferguson Group has a proud record of success advocating on behalf of local communities.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Sussex Strategy Groupsussex-strategy.comHQ: Toronto, ON, CanadaReported employees: 51-200 | Toronto, ON, Canada | 51-200 | Exact match | 77 contacts → |
“Established in 1998, Sussex Strategy Group is Canada’s leading government relations, strategic communications, digital advocacy and business advisory agency.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Ls2groupls2group.comHQ: Des Moines, IA, United StatesReported employees: 11-50 | Des Moines, IA, United States | 11-50 | Exact match | 72 contacts → |
“Larson Shannahan Slifka Group (LS2group) is a bipartisan public relations, public affairs, and marketing firm that guides its practices with one goal in mind: what others may do…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Bose Public Affairs Groupbosepublicaffairs.comHQ: Indianapolis, IN, United StatesReported employees: 11-50 | Indianapolis, IN, United States | 11-50 | Exact match | 66 contacts → |
“Bose Public Affairs Group successfully advocates for our clients’ legislative, regulatory, procurement, political and communication interests with offices in Indianapolis and…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Capitol Counsel, LLCcapitolcounsel.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 63 contacts → |
“Capitol Counsel, LLC is a full service government relations firm providing political analysis, strategic advice and advocacy services.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | GR Japangrjapan.com HQ: Tokyo, JapanReported employees: 51-200 | Tokyo, Japan | 51-200 | Exact match | 62 contacts → |
“GR Japan is the leading government relations and public affairs firm in Tokyo.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Michael Best Strategiesmichaelbeststrategies.com HQ: United StatesReported employees: 51-200 | United States | 51-200 | Exact match | 57 contacts → |
“We are innovators and thought leaders who believe in developing robust integrated solutions for our clients.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Beekeeper Groupbeekeepergroup.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 55 contacts → |
“At Beekeeper Group we believe in empowering people to advocate for impact by connecting them with stakeholders that are ready to take action so that our clients can achieve their…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Bolton-St. Johnsboltonstjohns.comHQ: Albany, NY, United StatesReported employees: 11-50 | Albany, NY, United States | 11-50 | Exact match | 53 contacts → |
“Smart strategy begins with being well informed.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  The Roosevelt Grouprooseveltdc.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 53 contacts → |
“TRG is a government relations consulting firm located on the doorstep of the United States Capitol.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Guerra Castellanos Y Asociadosgcya.netHQ: México, MexicoReported employees: 51-200 | México, Mexico | 51-200 | Exact match | 53 contacts → |
“Founded in January 2001 by Gabriel Guerra Castellanos, GC & A is a specialized consulting firm that offers strategic communication, lobbying, as well as government and community…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Acentoacento.es HQ: Madrid, SpainReported employees: 11-50 | Madrid, Spain | 11-50 | Exact match | 50 contacts → |
“Somos consultores estratégicos de asuntos públicos.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  The Livingston Grouplivingstongroupdc.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 43 contacts → |
“The Livingston Group (TLG) has delivered comprehensive government relations and lobbying services in Washington DC and globally since With nine different practice areas, our…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  S-3 Groups-3group.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 40 contacts → |
“S-3 is a full service policy and government relations firm providing comprehensive solutions in government affairs and public relations to top tier clients whose priorities demand…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 1,135 company matches
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Constituent relations firms: dataset insights
September 19, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
1,133 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 1,135 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 19, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Constituent relations firms by location
2 lists · largest firstEvery Constituent relations firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for constituent relations firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many constituent relations firms did RevenueBase find worldwide?
The saved snapshot records 1,135 matching company records, 9,307 tracked contacts and 3,751 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 19, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
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Cite this list
RevenueBase Data Team. Top 25 constituent relations firms worldwide. Snapshot: September 19, 2026. https://revenuebase.ai/companies/browse/constituent-relations-firms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 constituent relations firms worldwide
RevenueBase records 1,135 matching company records for constituent relations firms worldwide, with 9,307 tracked contacts and 3,751 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 19, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 constituent relations firms worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Mercury Public Affairs, LLCmercuryllc.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 390 contacts → |
“Mercury is a national bipartisan government relations and strategic communications firm.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | CMM DE LA Calle, Madrazo, Mancera SCcmmsc.com.mx HQ: Miguel Hidalgo, MexicoReported employees: Not recorded | Miguel Hidalgo, Mexico | Not recorded | Exact match | 362 contacts → |
“Somos una empresa consultora en asuntos públicos que conjunta sustancia con forma y traduce pensamiento al considerar gran diversidad de puntos de vista y panoramas.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | DKCdkcnews.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 349 contacts → |
“DKC is a full service public relations, marketing and government affairs firm and part of the Acceleration Community of Companies, Based in New York City, and with offices in Los…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | FLS Connectflsconnect.com HQ: St Paul, MN, IndiaReported employees: 51-200 | St Paul, MN, India | 51-200 | Exact match | 302 contacts → |
“Our primary interest at FLS Connect is to understand your campaign’s mission and objective and work closely to design efforts that meet your needs.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Cornerstone Government Affairscgagroup.com HQ: Washington, DC, United StatesReported employees: 201-500 | Washington, DC, United States | 201-500 | Exact match | 255 contacts → |
“Cornerstone Government Affairs is a full-service, bipartisan, employee-owned firm specializing in government relations and lobbying, public affairs, strategic communications, and…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | SKDKskdknick.com HQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 220 contacts → |
“SKDK provides strategic advice, public relations, crisis communications, advertising, direct mail, and research to national and international companies, advocacy organizations…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Global Strategy Groupglobalstrategygroup.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 179 contacts → |
“Global Strategy Group is the go-to public affairs, communications, and research partner for companies, causes, and campaigns.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Invariantinvariantgr.com HQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 166 contacts → |
“Invariant is a bipartisan business advisory firm, providing strategic advice to companies, trade associations, non-profits, and individuals on how to make Washington work for them.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Monument Advocacymonumentadvocacy.com HQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 97 contacts → |
“Monument Advocacy is a bipartisan firm that offers government relations, public affairs, strategic and crisis communications, and digital services.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Justice Works Youth Carejusticeworksyouthcare.com HQ: Rochester, PA, United StatesReported employees: 51-200 | Rochester, PA, United States | 51-200 | Exact match | 96 contacts → |
“Justice Works Youth Care is a Government Relations company located in 615 Virginia Ave, Rochester, Pennsylvania, United States.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Earnscliffe Strategiesearnscliffe.ca HQ: Ottawa, ON, CanadaReported employees: 51-200 | Ottawa, ON, Canada | 51-200 | Exact match | 84 contacts → |
“Founded in 1989 and independently owned by our principals, Earnscliffe operates from offices in Ottawa-Gatineau, Toronto and Vancouver.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | TFG The Ferguson Groupthefergusongroup.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 84 contacts → |
“Founded in 1982, The Ferguson Group has a proud record of success advocating on behalf of local communities.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Sussex Strategy Groupsussex-strategy.com HQ: Toronto, ON, CanadaReported employees: 51-200 | Toronto, ON, Canada | 51-200 | Exact match | 77 contacts → |
“Established in 1998, Sussex Strategy Group is Canada’s leading government relations, strategic communications, digital advocacy and business advisory agency.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Ls2groupls2group.com HQ: Des Moines, IA, United StatesReported employees: 11-50 | Des Moines, IA, United States | 11-50 | Exact match | 72 contacts → |
“Larson Shannahan Slifka Group (LS2group) is a bipartisan public relations, public affairs, and marketing firm that guides its practices with one goal in mind: what others may do…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Bose Public Affairs Groupbosepublicaffairs.com HQ: Indianapolis, IN, United StatesReported employees: 11-50 | Indianapolis, IN, United States | 11-50 | Exact match | 66 contacts → |
“Bose Public Affairs Group successfully advocates for our clients’ legislative, regulatory, procurement, political and communication interests with offices in Indianapolis and…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Capitol Counsel, LLCcapitolcounsel.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 63 contacts → |
“Capitol Counsel, LLC is a full service government relations firm providing political analysis, strategic advice and advocacy services.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | GR Japangrjapan.com HQ: Tokyo, JapanReported employees: 51-200 | Tokyo, Japan | 51-200 | Exact match | 62 contacts → |
“GR Japan is the leading government relations and public affairs firm in Tokyo.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Michael Best Strategiesmichaelbeststrategies.com HQ: United StatesReported employees: 51-200 | United States | 51-200 | Exact match | 57 contacts → |
“We are innovators and thought leaders who believe in developing robust integrated solutions for our clients.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Beekeeper Groupbeekeepergroup.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 55 contacts → |
“At Beekeeper Group we believe in empowering people to advocate for impact by connecting them with stakeholders that are ready to take action so that our clients can achieve their…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Bolton-St. Johnsboltonstjohns.com HQ: Albany, NY, United StatesReported employees: 11-50 | Albany, NY, United States | 11-50 | Exact match | 53 contacts → |
“Smart strategy begins with being well informed.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | The Roosevelt Grouprooseveltdc.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 53 contacts → |
“TRG is a government relations consulting firm located on the doorstep of the United States Capitol.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Guerra Castellanos Y Asociadosgcya.net HQ: México, MexicoReported employees: 51-200 | México, Mexico | 51-200 | Exact match | 53 contacts → |
“Founded in January 2001 by Gabriel Guerra Castellanos, GC & A is a specialized consulting firm that offers strategic communication, lobbying, as well as government and community…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Acentoacento.es HQ: Madrid, SpainReported employees: 11-50 | Madrid, Spain | 11-50 | Exact match | 50 contacts → |
“Somos consultores estratégicos de asuntos públicos.” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | The Livingston Grouplivingstongroupdc.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 43 contacts → |
“The Livingston Group (TLG) has delivered comprehensive government relations and lobbying services in Washington DC and globally since With nine different practice areas, our…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | S-3 Groups-3group.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 40 contacts → |
“S-3 is a full service policy and government relations firm providing comprehensive solutions in government affairs and public relations to top tier clients whose priorities demand…” Recorded description excerpt · September 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Constituent relations firms: dataset insights
September 19, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
1,133 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 1,135 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 19, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Constituent relations firms by location
2 lists · largest firstEvery Constituent relations firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for constituent relations firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many constituent relations firms did RevenueBase find worldwide?
The saved snapshot records 1,135 matching company records, 9,307 tracked contacts and 3,751 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 19, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 constituent relations firms worldwide. Snapshot: September 19, 2026. https://revenuebase.ai/companies/browse/constituent-relations-firms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗