Company lists · Data refreshed September 2026

Top 25 Lobbying firms based in Washington, United States

Name: Lobbying 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 20, 2026 581 companies tracked

RevenueBase identified 581 lobbying firms headquartered in Washington, United States as of September 2026 and tracks 9,878 professional contacts across them, including 5,431 with verified work emails. Washington is the largest hub.

This list covers lobbying 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 20, 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 20, 2026 86% judged on-target in blind review

581Companies

9,878Contacts tracked

5,431Verified emails

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The 25 largest lobbying firms based in Washington, United States

Ranked by team size

Top 25 of 581 lobbying firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to lobbying 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	Venable LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,790 contacts →
	Indirect evidence “Committed to Your Success – As a law firm of more than 900 professionals, Venable delivers legal services globally in every area of regulatory compliance, government affairs…” Source: RevenueBase Database · checked Sep 20, 2026
2	Wiley Rein LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	501-1,000	576 contacts →
	Indirect evidence “Founded in 1983, Wiley is a dominant presence in the nation’s capital.” Source: RevenueBase Database · checked Sep 20, 2026
3	DDC Public Affairs	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	411 contacts →
	Indirect evidence “DDC Public Affairs builds communities of advocates that impact policy and win campaigns.” Source: RevenueBase Database · checked Sep 20, 2026
4	Cornerstone Government Affairs	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	255 contacts →
	Strong 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, 2026
5	BGR Group	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	243 contacts →
	Strong 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, 2026
6	Keller And Heckman LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	230 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 20, 2026
7	SKDK	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	220 contacts →
	Indirect evidence “SKDK provides strategic advice, public relations, crisis communications, advertising, direct mail, and research to national and international companies, advocacy organizations…” Source: RevenueBase Database · checked Sep 20, 2026
8	AVŌQ	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	205 contacts →
	Indirect evidence “Excellence isn’t enough.” Source: RevenueBase Database · checked Sep 20, 2026
9	DCI	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	198 contacts →
	Indirect 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, 2026
10	Invariant	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 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 20, 2026
11	Zuckerman Spaeder LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	155 contacts →
	Indirect evidence “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Source: RevenueBase Database · checked Sep 20, 2026
12	National Journal	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	124 contacts →
	Indirect evidence “We deliver insightful journalism, produce custom content and editable slides, and advise organizations on their advocacy and PAC engagement strategies.” Source: RevenueBase Database · checked Sep 20, 2026
13	Monument Advocacy	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	97 contacts →
	Indirect 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 20, 2026
14	CFS Compliance	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	90 contacts →
	Indirect evidence “CFS Compliance is your one stop shop for all your compliance needs.” Source: RevenueBase Database · checked Sep 20, 2026
15	TFG The Ferguson Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 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 20, 2026
16	VAN Scoyoc Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	82 contacts →
	Indirect 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 20, 2026
17	Holtzman Vogel	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	80 contacts →
	Indirect evidence “HOLTZMAN VOGEL PROTECTS THE HIGHEST PROFILE VOICES IN BUSINESS, POLITICS AND ADVOCACY For 25 years, Holtzman Vogel has represented Fortune 500 companies, non-profits, high net…” Source: RevenueBase Database · checked Sep 20, 2026
18	Cassidy & Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	79 contacts →
	Indirect evidence “At Cassidy and Associates, we make Washington work for you.” Source: RevenueBase Database · checked Sep 20, 2026
19	Forbes Tate Partners	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	76 contacts →
	Indirect 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 20, 2026
20	Reno & Cavanaugh, Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	73 contacts →
	Indirect evidence “Since 1977, Reno & Cavanaugh has been a national law firm dedicated to strengthening communities through strategic use of public and private resources.” Source: RevenueBase Database · checked Sep 20, 2026
21	DOW Lohnes	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	73 contacts →
	Indirect evidence “On January 1, 2014, Dow Lohnes merged with Cooley LLP.” Source: RevenueBase Database · checked Sep 20, 2026
22	Thorn RUN Partners	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	69 contacts →
	Indirect 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 20, 2026
23	NJI	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	69 contacts →
	Indirect evidence “NJI is an award-winning global agency that provides creative strategy for public affairs.” Source: RevenueBase Database · checked Sep 20, 2026
24	Capitol Counsel, LLC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 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 20, 2026
25	Mcdermott	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	60 contacts →
	Strong evidence “McDermott+ serves health industry clients with one-stop lobbying services, data analytics and modeling and policy advice.” Source: RevenueBase Database · checked Sep 20, 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: lobbying 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 lobbying firms.
Partial evidence: Its own public description names part of lobbying firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name lobbying 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 581 lobbying firms based in Washington, United States

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Lobbying firms based in Washington, United States at a glance

As of Sep 20, 2026

55.0%Verified-email coverage

17.0Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · Washington

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

404

11-50

135

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 581 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 lobbying 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 “lobbying 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 lobbying 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 lobbying 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, 5,431 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.

Lobbying 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 lobbying 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 lobbying firms are there based in Washington, United States?

RevenueBase identified 581 lobbying 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?

Venable LLP, headquartered in Washington, tops this list with the largest team on record.

Which city has the most lobbying firms?

Washington leads with 581 headquartered companies, followed by Sacramento (106) and Austin (84).

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 5,431 verified decision-maker contacts tracked across these 581 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.