Company lists · Data refreshed September 2026

Top 25 Federal affairs firms based in Washington, United States

Name: Federal affairs 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 19, 2026 330 companies tracked

RevenueBase identified 330 federal affairs firms headquartered in Washington, United States as of September 2026 and tracks 4,221 professional contacts across them, including 2,177 with verified work emails. Washington is the largest hub.

This list covers federal affairs firms headquartered in Washington, United States, 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 19, 2026.

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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

330Companies

4,221Contacts tracked

2,177Verified emails

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The 25 largest federal affairs firms based in Washington, United States

Ranked by team size

Top 25 of 330 federal affairs firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to federal affairs firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Cornerstone Government Affairs	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	201-500	255 contacts →
	Partial 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 19, 2026
2	BGR Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	243 contacts →
	Indirect 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 19, 2026
3	Mcallister & Quinn	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	170 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 19, 2026
4	Invariant	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	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 19, 2026
5	Public & Government Affairs At Edelman	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	201-500	121 contacts →
	Partial evidence “Edelman’s public and government affairs team of consultants are trusted and experienced public affairs advisors-including former government officials, political advisors, policy…” Source: RevenueBase Database · checked Sep 19, 2026
6	Monument Advocacy	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	97 contacts →
	Partial evidence “Monument Advocacy is a bipartisan firm that offers government relations, public affairs, strategic and crisis communications, and digital services.” Source: RevenueBase Database · checked Sep 19, 2026
7	TFG The Ferguson Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	84 contacts →
	Indirect evidence “Founded in 1982, The Ferguson Group has a proud record of success advocating on behalf of local communities.” Source: RevenueBase Database · checked Sep 19, 2026
8	VAN Scoyoc Associates	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	82 contacts →
	Partial evidence “For more than 30 years, Van Scoyoc Associates (VSA) has been developing and executing tailored government affairs strategies for its clients.” Source: RevenueBase Database · checked Sep 19, 2026
9	Cassidy & Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	79 contacts →
	Indirect evidence “At Cassidy and Associates, we make Washington work for you.” Source: RevenueBase Database · checked Sep 19, 2026
10	Forbes Tate Partners	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	76 contacts →
	Partial evidence “Bipartisan public affairs firm driving outcomes for our partners that achieve their goals and build value in today’s policy and political landscape.” Source: RevenueBase Database · checked Sep 19, 2026
11	Thorn RUN Partners	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	69 contacts →
	Partial evidence “Established in 2010, Thorn Run Partners is a leading Washington, DC-based government affairs firm whose members are Capitol Hill veterans with over a century’s experience in…” Source: RevenueBase Database · checked Sep 19, 2026
12	Capitol Counsel, LLC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	63 contacts →
	Indirect evidence “Capitol Counsel, LLC is a full service government relations firm providing political analysis, strategic advice and advocacy services.” Source: RevenueBase Database · checked Sep 19, 2026
13	Mcdermott	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	60 contacts →
	Indirect evidence “McDermott+ serves health industry clients with one-stop lobbying services, data analytics and modeling and policy advice.” Source: RevenueBase Database · checked Sep 19, 2026
14	Beekeeper Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	55 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
15	Mindset	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	53 contacts →
	Indirect evidence “Mindset is a bipartisan public policy firm that blends thoughtful research and analysis, strategic advisory services, and sophisticated advocacy to address the challenges and…” Source: RevenueBase Database · checked Sep 19, 2026
16	The Roosevelt Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	53 contacts →
	Indirect evidence “TRG is a government relations consulting firm located on the doorstep of the United States Capitol.” Source: RevenueBase Database · checked Sep 19, 2026
17	Lewis-Burke Associates LLC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	52 contacts →
	Indirect evidence “Lewis-Burke Associates LLC is a leading full service government relations firm specializing in advocating for the public policy interests of institutions of higher education and…” Source: RevenueBase Database · checked Sep 19, 2026
18	Cgcn Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	52 contacts →
	Indirect evidence “CGCN Group is an integrated advocacy and strategic communications firm that specializes in helping Fortune 500 companies, non-profits, and trade associations navigate complex…” Source: RevenueBase Database · checked Sep 19, 2026
19	Advocacy Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	51 contacts →
	Indirect evidence “Advocacy Associates specializes in strategic grassroots and advocacy approaches designed to address the individual needs of our clients - no cookie cutter approaches are allowed.” Source: RevenueBase Database · checked Sep 19, 2026
20	Carmen Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	51 contacts →
	Partial evidence “Carmen Group is Washington’s leading government affairs consulting firm.” Source: RevenueBase Database · checked Sep 19, 2026
21	Olsson Frank Weeda Terman Matz PC	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	49 contacts →
	Partial evidence “Olsson Frank Weeda Terman Matz PC The nation’s premier FDA, USDA, and health care law firm, serving clients before federal agencies, courts, and Congress.” Source: RevenueBase Database · checked Sep 19, 2026
22	Vogel Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	44 contacts →
	Indirect evidence “The Vogel Group is a Washington, D.C.” Source: RevenueBase Database · checked Sep 19, 2026
23	Rokk Solutions	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	44 contacts →
	Partial evidence “ROKK Solutions is a full-service, bipartisan public affairs firm that provides its clients with winning communications strategies designed to influence policy and sway opinion.” Source: RevenueBase Database · checked Sep 19, 2026
24	The Livingston Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	43 contacts →
	Indirect evidence “The Livingston Group (TLG) has delivered comprehensive government relations and lobbying services in Washington DC and globally since With nine different practice areas, our…” Source: RevenueBase Database · checked Sep 19, 2026
25	S-3 Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	40 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026

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: federal affairs 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 federal affairs firms.
Partial evidence: Its own public description names part of federal affairs firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name federal affairs 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 330 federal affairs firms based in Washington, United States

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Federal affairs firms based in Washington, United States at a glance

As of Sep 19, 2026

51.6%Verified-email coverage

12.8Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

234

11-50

51-200

201-500

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 330 companies.

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 federal affairs 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.
What qualifies: Companies headquartered in Washington, United States whose own description of what they do matches “federal affairs 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 federal affairs 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 federal affairs firms, and records with no verified work email. Companies headquartered outside Washington are excluded even when they keep an office there.
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, 2,177 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 19, 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.

Federal affairs firms by metro in the United States

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 federal affairs 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 federal affairs firms are there based in Washington, United States?

RevenueBase identified 330 federal affairs firms headquartered in Washington, United States 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?

Cornerstone Government Affairs, headquartered in Washington, tops this list with the largest team on record.

Which city has the most federal affairs firms?

Washington leads with 330 headquartered companies, followed by Sacramento (64) and Austin (53).

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 2,177 verified decision-maker contacts tracked across these 330 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 19, 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.