Company lists · Data refreshed September 2026

Top 25 Legislative consulting firms based in Washington, United States

Name: Legislative 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 4, 2026 536 companies tracked

RevenueBase identified 536 legislative consulting firms headquartered in Washington, United States as of September 2026 and tracks 7,554 professional contacts across them, including 3,965 with verified work emails. Washington is the largest hub.

This list covers legislative consulting 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 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 HQ checked on every row Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

536Companies

7,554Contacts tracked

3,965Verified emails

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The 25 largest legislative consulting firms based in Washington, United States

Ranked by team size

Top 25 of 536 legislative consulting firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names legislative consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Venable LLPIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1,001-5,000	1,791
	“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: company website · checked Sep 4, 2026
2	DDC Public AffairsIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	411
	“DDC Public Affairs builds communities of advocates that impact policy and win campaigns.” Source: company website · checked Sep 4, 2026
3	Cornerstone Government AffairsIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	201-500	256
	“Cornerstone Government Affairs is a full-service, bipartisan, employee-owned firm specializing in government relations and lobbying, public affairs, strategic communications, and…” Source: company website · checked Sep 4, 2026
4	DCIPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	194
	“DCI Group is an independent public affairs consulting firm that specializes in public relations, crisis management, grassroots engagement, and digital advocacy.” Source: company website · checked Sep 4, 2026
5	Mcallister & QuinnPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	170
	“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: company website · checked Sep 4, 2026
6	InvariantIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	169
	“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: company website · checked Sep 4, 2026
7	Public & Government Affairs At EdelmanIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	201-500	125
	“Edelman’s public and government affairs team of consultants are trusted and experienced public affairs advisors-including former government officials, political advisors, policy…” Source: company website · checked Sep 4, 2026
8	The Cohen GroupIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	111
	“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…” Source: company website · checked Sep 4, 2026
9	VAN Scoyoc AssociatesIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	82
	“For more than 30 years, Van Scoyoc Associates (VSA) has been developing and executing tailored government affairs strategies for its clients.” Source: company website · checked Sep 4, 2026
10	TFG The Ferguson GroupIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	81
	“Founded in 1982, The Ferguson Group has a proud record of success advocating on behalf of local communities.” Source: company website · checked Sep 4, 2026
11	Mclarty AssociatesIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	79
	“McLarty Associates, An Ankura Company, is the global strategy firm led by former Clinton White House Chief of Staff Thomas F.” Source: company website · checked Sep 4, 2026
12	Cassidy & AssociatesIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	78
	“At Cassidy and Associates, we make Washington work for you.” Source: company website · checked Sep 4, 2026
13	Capitol Counsel, LLCIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	62
	“Capitol Counsel, LLC is a full service government relations firm providing political analysis, strategic advice and advocacy services.” Source: company website · checked Sep 4, 2026
14	McdermottIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	61
	“McDermott+ serves health industry clients with one-stop lobbying services, data analytics and modeling and policy advice.” Source: company website · checked Sep 4, 2026
15	Freedman Consulting, LLCPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	59
	“Freedman Consulting, LLC, a mission-driven firm, offers strategic consulting services to foundations, nonprofit organizations, and public interest coalitions, advising many of the…” Source: company website · checked Sep 4, 2026
16	Beekeeper GroupIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	56
	“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: company website · checked Sep 4, 2026
17	Cgcn GroupIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	52
	“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: company website · checked Sep 4, 2026
18	Hilltop Public SolutionsIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	52
	“At Hilltop, we manage high-stakes, high-profile campaigns, build coalitions and find and mobilize grasstops and grassroots advocates across the country.” Source: company website · checked Sep 4, 2026
19	Ward Circle StrategiesIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	51
	“Ward Circle Strategies, Inc.” Source: company website · checked Sep 4, 2026
20	MindsetIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	51
	“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: company website · checked Sep 4, 2026
21	ARC InitiativesIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	51
	“We are among Washington’s leading strategists, campaigners, communicators, team builders, creatives, storytellers, implementers, and advisors.” Source: company website · checked Sep 4, 2026
22	Carmen GroupPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	51
	“Carmen Group is Washington’s leading government affairs consulting firm.” Source: company website · checked Sep 4, 2026
23	Lewis-Burke Associates LLCIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	50
	“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: company website · checked Sep 4, 2026
24	Advocacy AssociatesIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	49
	“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: company website · checked Sep 4, 2026
25	The Roosevelt GroupPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	49
	“TRG is a government relations consulting firm located on the doorstep of the United States Capitol.” Source: company website · checked Sep 4, 2026

Showing 25 of 536 legislative consulting firms based in Washington, United States

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Legislative consulting firms based in Washington, United States at a glance

As of Sep 4, 2026

1-10Median size (employees)

WashingtonLargest hub · 536 HQs

Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

389

11-50

118

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 536 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 legislative consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “legislative consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among legislative consulting 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 an evidence 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, 3,965 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 4, 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.

Legislative consulting firms by metro in the United States

Frequently asked

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

RevenueBase identified 536 legislative consulting 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 legislative consulting firms?

Washington leads with 536 headquartered companies, followed by Sacramento (90) and Austin (79).

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 3,965 verified decision-maker contacts tracked across these 536 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 4, 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.