Company lists · Data refreshed September 2026
Top 25 Grassroots advocacy firms worldwide
RevenueBase identified 2,884 grassroots advocacy firms worldwide as of September 2026 and tracks 24,611 professional contacts across them, including 9,980 with verified work emails. The United States is the largest market and Washington the largest hub.
This list covers grassroots advocacy firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026. Country and city lists for grassroots advocacy firms follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 grassroots advocacy firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 411 contacts → | ||||
Partial evidence “DDC Public Affairs builds communities of advocates that impact policy and win campaigns.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 398 contacts → | ||||
Indirect evidence “The Outreach Team is a national consulting firm working to make the world a better place.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 390 contacts → | ||||
Indirect evidence “Mercury is a national bipartisan government relations and strategic communications firm.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 357 contacts → | ||||
Indirect evidence “Quorum is your AI-powered public affairs software to get information and execute strategy all in one place.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 336 contacts → | ||||
Partial evidence “FieldWorks brings innovative grassroots and field strategies to Democratic and progressive campaigns and organizations.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 309 contacts → | ||||
Partial evidence “Grassroots Campaigns, Inc.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 255 contacts → | ||||
Indirect evidence “Cornerstone Government Affairs is a full-service, bipartisan, employee-owned firm specializing in government relations and lobbying, public affairs, strategic communications, and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 243 contacts → | ||||
Partial evidence “The Services You Need BGR Group offers an integrated suite of bipartisan lobbying, strategic communications and advocacy solutions that help meet challenges in a risky…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 239 contacts → | ||||
Indirect evidence “We’re bold.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 236 contacts → | ||||
Indirect evidence “Cohen Milstein Sellers & Toll LLP champions the causes of real people-workers, consumers, small business owners, investors, and whistleblowers-working to deliver corporate reforms…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 226 contacts → | ||||
Indirect evidence “At MissionWired, we believe your world-changing cause deserves more than marginal gains.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 205 contacts → | ||||
Indirect evidence “Excellence isn’t enough.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 198 contacts → | ||||
Strong evidence “DCI Group is an independent public affairs consulting firm that specializes in public relations, crisis management, grassroots engagement, and digital advocacy.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 195 contacts → | ||||
Partial evidence “Public Citizen is a nonprofit consumer advocacy organization that champions the public interest – your interests – in the halls of power.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 188 contacts → | ||||
Indirect evidence “Strategy + Execution = Results.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 187 contacts → | ||||
Partial evidence “Since its inception, Lilly & Company has built a unique and comprehensive strategy for providing the best possible services available in political fundraising and grassroots…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 179 contacts → | ||||
Indirect evidence “Global Strategy Group is the go-to public affairs, communications, and research partner for companies, causes, and campaigns.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 170 contacts → | ||||
Indirect evidence “We believe there’s no force more powerful than people taking collective action on the things they care about.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 166 contacts → | ||||
Indirect evidence “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.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 145 contacts → | ||||
Indirect evidence “At Sanford Heisler Sharp McKnight, our team of knowledgeable attorneys is committed to representing clients in their claims against powerful entities.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 144 contacts → | ||||
Indirect evidence “For Our Future is a 501(c)(3), 501(c)(4), and PAC that empowers people in battleground states and districts to organize their communities, build progressive power, and fight for a…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 143 contacts → | ||||
Indirect evidence “We're a strategy consultancy, a creative agency and a social movement incubator.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 140 contacts → | ||||
Indirect evidence “At Fenton, we are communications strategists for social change.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 133 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 127 contacts → | ||||
Indirect evidence “What people say and do in government can have a profound impact on your organization.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: grassroots advocacy firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names grassroots advocacy firms.
- Partial evidence
- Its own public description names part of grassroots advocacy firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name grassroots advocacy firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 2,884 grassroots advocacy firms worldwide
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Grassroots advocacy firms worldwide at a glance
As of Sep 20, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among grassroots advocacy firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for grassroots advocacy firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “grassroots advocacy firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names grassroots advocacy firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among grassroots advocacy firms, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- 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 listed company carries at least one verified work email, 9,980 across the full list. 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 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Grassroots advocacy firms by location
19 lists · largest firstEvery Grassroots advocacy firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Grassroots advocacy firms based in the United States2,026
- Grassroots advocacy firms based in Canada42
- Grassroots advocacy firms based in Australia36
- Grassroots advocacy firms based in Brazil30
Cities
- Grassroots advocacy firms based in Washington, United States416
- Grassroots advocacy firms based in Sacramento, United States73
- Grassroots advocacy firms based in New York, United States64
- Grassroots advocacy firms based in Austin, United States55
- Grassroots advocacy firms based in Chicago, United States44
- Grassroots advocacy firms based in Los Angeles, United States43
- Grassroots advocacy firms based in Denver, United States36
- Grassroots advocacy firms based in Boston, United States34
- Grassroots advocacy firms based in Phoenix, United States31
- Grassroots advocacy firms based in Atlanta, United States30
- Grassroots advocacy firms based in Arlington, United States28
- Grassroots advocacy firms based in Tallahassee, United States27
- Grassroots advocacy firms based in Alexandria, United States25
- Grassroots advocacy firms based in Columbus, United States25
- Grassroots advocacy firms based in Lansing, United States25
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names grassroots advocacy firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many grassroots advocacy firms are there worldwide?
RevenueBase identified 2,884 grassroots advocacy firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
DDC Public Affairs, headquartered in Washington, tops this list with the largest team on record.
Which country has the most grassroots advocacy firms?
The United States leads with 2,026 companies, followed by Canada (42) and Australia (36). Every grassroots advocacy firms list by country and city is linked on this page.
Which city has the most grassroots advocacy firms?
Washington leads with 416 headquartered companies, followed by Sacramento (73) and New York (64).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 9,980 verified decision-maker contacts tracked across these 2,884 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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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 Smart Search, 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.