Company lists · Data refreshed September 2026

Top 25 Advocacy organizations consulting firms based in Washington, United States

Name: Advocacy organizations consulting firms based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 1,296 companies tracked

RevenueBase identified 1,296 company matches for advocacy organizations consulting firms associated with Washington, United States as of September 2026 and tracks 17,047 professional contacts across them, including 8,589 with verified work emails. Across the United States, Washington is the largest hub for this category.

This list covers company matches for advocacy organizations consulting firms associated with Washington, United States, 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 27, 2026.

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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 27, 2026 How this list was built

1,296Companies

17,047Contacts tracked

8,589Verified emails

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The 25 largest advocacy organizations consulting firms based in Washington, United States

Ranked by team size

Top 25 of 1,296 company matches for advocacy organizations consulting firms based in Washington, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 27, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	APCO	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	1,001-5,000	1,578 contacts →
	Exact match “APCO is a global advisory and advocacy firm helping organizations build the un/common ground upon which progress is made.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
2	Wiley Rein LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	501-1,000	576 contacts →
	Exact match “Founded in 1983, Wiley is a dominant presence in the nation’s capital.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
3	DDC Public Affairs	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	411 contacts →
	Exact match “DDC Public Affairs builds communities of advocates that impact policy and win campaigns.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
4	Bully Pulpit International	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	282 contacts →
	Exact match “Bully Pulpit International (BPI) is an outcomes agency at the intersection of business, politics, and policy.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
5	TCG	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	263 contacts →
	Exact match “Traditional we are not.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
6	Cornerstone Government Affairs	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	201-500	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 27, 2026 · View company records in RevenueBase
7	BGR Group	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	243 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
8	Cohen Milstein Sellers & Toll LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	236 contacts →
	Exact match “Cohen Milstein Sellers & Toll LLP champions the causes of real people-workers, consumers, small business owners, investors, and whistleblowers-working to deliver corporate reforms…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
9	Keller And Heckman LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	230 contacts →
	Exact match “Keller and Heckman, founded in 1962, has a broad practice in the areas of regulatory law, public policy, and litigation, serving both domestic and international clients.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
10	Missionwired	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	201-500	226 contacts →
	Exact match “At MissionWired, we believe your world-changing cause deserves more than marginal gains.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
11	SKDK	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	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 27, 2026 · View company records in RevenueBase
12	M R	Exact match	Washington, United StatesHQ recorded Sep 27, 2026	51-200	208 contacts →
	Exact match “We are M+R.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
13	AVŌQ	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	201-500	205 contacts →
	Exact match “Excellence isn’t enough.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
14	DCI	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	198 contacts →
	Exact match “DCI Group is an independent public affairs consulting firm that specializes in public relations, crisis management, grassroots engagement, and digital advocacy.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
15	Mcallister & Quinn	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	170 contacts →
	Exact match “McAllister & Quinn is a Washington, DC consulting firm that provides a comprehensive range of services to a diverse group of clients with issues before the federal government.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
16	Invariant	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	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 27, 2026 · View company records in RevenueBase
17	Rational 360	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	161 contacts →
	Exact match “The Rational Way: All in Partners Rational 360 is a leading full-service strategic communications and digital agency, with offices and staff located across the country.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
18	Zuckerman Spaeder LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	155 contacts →
	Exact match “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
19	Herren Associates	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	142 contacts →
	Exact match “Here at Herren, our goals are to drive efficiency and maximize the value of every dollar our clients spend.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
20	National Journal	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	124 contacts →
	Exact match “We deliver insightful journalism, produce custom content and editable slides, and advise organizations on their advocacy and PAC engagement strategies.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
21	Public & Government Affairs At Edelman	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	201-500	121 contacts →
	Exact match “Edelman’s public and government affairs team of consultants are trusted and experienced public affairs advisors-including former government officials, political advisors, policy…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
22	Narrative Strategies	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	111 contacts →
	Exact match “Narrative is a full-service strategic communications firm creatively solving today’s most demanding reputational and public affairs challenges.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
23	The Cohen Group	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	110 contacts →
	Exact match “Who We Are A talented team of experts with years of experience in both government and industry, with a passion for finding solutions and a deep understanding of the institutions…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
24	Powers LAW	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	101 contacts →
	Exact match “Powers Pyles Sutter & Verville PC is a Washington, DC-based law firm that began with a strong focus on healthcare law and healthcare policy and has gradually expanded capabilities…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
25	VOX Global	Exact match	Washington, DC, United StatesHQ recorded Sep 27, 2026	51-200	99 contacts →
	Exact match “It starts with a goal: yours.” Recorded in the RevenueBase company graph · Sep 27, 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 “advocacy organizations consulting 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 1,296 advocacy organizations consulting firms based in Washington, United States

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Advocacy organizations consulting firms based in Washington, United States at a glance

As of Sep 27, 2026

50.4%Verified-email coverage

13.2Average contacts per company

1-10Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

932

11-50

283

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 1,296 companies.

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.
What qualifies: Company records associated with Washington, United States whose business descriptions match “advocacy organizations consulting 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 8,589 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 27, 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.

Advocacy organizations consulting firms by metro in the United States

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 “advocacy organizations consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many advocacy organizations consulting firms are there based in Washington, United States?

RevenueBase identified 1,296 company matches for advocacy organizations consulting firms associated with Washington, United States 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?

APCO tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most advocacy organizations consulting firms?

Washington leads the United States with 1,296 company records, followed by New York (639) and Chicago (327).

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 8,589 professional contacts with verified work emails tracked across these 1,296 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 27, 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 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.