Company lists · Data refreshed September 2026

Top 25 Legislative consulting firms based in the United States

RevenueBase identified 2,430 legislative consulting firms headquartered in the United States as of September 2026 and tracks 23,563 professional contacts across them, including 11,771 with verified work emails and 11,770 with mobile numbers. Washington is the largest hub.

This list covers legislative consulting firms headquartered in the 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
2,430Companies
23,563Contacts tracked
11,771Verified emails
11,770Mobile numbers
Unlock all 2,430 companies Free signup · no credit card · 500 free credits

The 25 largest legislative consulting firms based in the United States

Ranked by team size
Top 25 of 2,430 legislative consulting firms based in the 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.
#CompanyHeadquartersEmployeesContacts
1Cincinnati, IN, United StatesHQ checked Sep 4, 20261,001-5,0001,963

“At Taft, we work as one team, driven and committed to helping you succeed.”

Source: company website · checked Sep 4, 2026
2
Venable LLPIndirect evidence
Washington, DC, United StatesHQ checked Sep 4, 20261,001-5,0001,791

“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
3
Bracewell LLPIndirect evidence
Houston, TX, United StatesHQ checked Sep 4, 2026501-1,000943

“Bracewell LLP is a leading law and government relations firm.”

Source: company website · checked Sep 4, 2026
4Denver, NV, United StatesHQ checked Sep 4, 2026501-1,000896

“For decades, we’ve positioned ourselves at the intersection of law, business and policy to bring a multidisciplinary strategy to every issue.”

Source: company website · checked Sep 4, 2026
5
DDC Public AffairsIndirect evidence
Washington, DC, United StatesHQ checked Sep 4, 202651-200411

“DDC Public Affairs builds communities of advocates that impact policy and win campaigns.”

Source: company website · checked Sep 4, 2026
6
Mercury Public Affairs, LLCIndirect evidence
New York, FL, United StatesHQ checked Sep 4, 202651-200395

“Mercury is a national bipartisan government relations and strategic communications firm.”

Source: company website · checked Sep 4, 2026
7
Mcnees Wallace & NurickIndirect evidence
Harrisburg, PA, United StatesHQ checked Sep 4, 2026201-500315

“Since 1935, McNees Wallace & Nurick has been a trusted, client-focused law firm delivering practical, results-driven legal solutions to businesses, individuals, and organizations.”

Source: company website · checked Sep 4, 2026
8Washington, DC, United StatesHQ checked Sep 4, 2026201-500256

“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
9
BGR GroupIndirect evidence
Washington, TX, United StatesHQ checked Sep 4, 202651-200236

“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: company website · checked Sep 4, 2026
10
SKDKIndirect evidence
Washington, CA, United StatesHQ checked Sep 4, 202651-200216

“SKDK provides strategic advice, public relations, crisis communications, advertising, direct mail, and research to national and international companies, advocacy organizations…”

Source: company website · checked Sep 4, 2026
11
DCIPartial evidence
Washington, DC, United StatesHQ checked Sep 4, 202651-200194

“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
12
Plus CommunicationsIndirect evidence
Arlington, VA, United StatesHQ checked Sep 4, 2026201-500189

“Strategy + Execution = Results.”

Source: company website · checked Sep 4, 2026
13
ASI GovernmentIndirect evidence
Herndon, VA, United StatesHQ checked Sep 4, 202651-200186

“For nearly two decades, ASI Government has served as a trusted advisor to government leaders seeking to improve mission performance, enhance organizational effectiveness and drive…”

Source: company website · checked Sep 4, 2026
14
Mcallister & QuinnPartial evidence
Washington, DC, United StatesHQ checked Sep 4, 202651-200170

“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
15
InvariantIndirect evidence
Washington, DC, United StatesHQ checked Sep 4, 202651-200169

“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
16
Ripple EffectPartial evidence
Rockville, MD, United StatesHQ checked Sep 4, 2026201-500151

“Ripple Effect provides professional consulting and exceptional talent for federal, private, and non-profit clients to deliver some of the most crucial policies and programs that…”

Source: company website · checked Sep 4, 2026
17
Mcguirewoods ConsultingIndirect evidence
Richmond, SC, United StatesHQ checked Sep 4, 202651-200128

“What people say and do in government can have a profound impact on your organization.”

Source: company website · checked Sep 4, 2026
18Washington, DC, United StatesHQ checked Sep 4, 2026201-500125

“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
19
ACTUMPartial evidence
Los Angeles, CA, United StatesHQ checked Sep 4, 202651-200123

“Actum is a global consulting firm built to solve complex problems at the intersection of business, politics and media.”

Source: company website · checked Sep 4, 2026
20
Government Services GroupIndirect evidence
Nationwide, United StatesHQ checked Sep 4, 20261,001-5,000121
Source: company website · checked Sep 4, 2026
21
Mcking ConsultingPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-200119

“McKing Consulting Corporation provides a variety of general and specialized management consulting services to the federal government, state agencies, nonprofits, and public and…”

Source: company website · checked Sep 4, 2026
22
The Cohen GroupIndirect evidence
Washington, DC, United StatesHQ checked Sep 4, 202651-200111

“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
23
MultistateIndirect evidence
Arlington, VA, United StatesHQ checked Sep 4, 202651-200103

“MultiState is a full-service state and local government relations company.”

Source: company website · checked Sep 4, 2026
24
Stateside AssociatesIndirect evidence
Arlington, VA, United StatesHQ checked Sep 4, 202651-200103

“Stateside Associates is the largest state and local government affairs firm.”

Source: company website · checked Sep 4, 2026
25
Monument AdvocacyIndirect evidence
Washington, WA, United StatesHQ checked Sep 4, 202651-20095

“Monument Advocacy is a bipartisan firm that offers government relations, public affairs, strategic and crisis communications, and digital services.”

Source: company website · checked Sep 4, 2026

Showing 25 of 2,430 legislative consulting firms based in the United States

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Legislative consulting firms based in the United States at a glance

As of Sep 4, 2026
1-10Median size (employees)
WashingtonLargest hub · 536 HQs
11,770Contacts with mobile numbers
Sep 4, 2026Data refreshed

Companies by employee count

1-10
1,959
11-50
381
51-200
65
201-500
11
501-1,000
4
1,001-5,000
3

Verified emails by last verification

0–30
0
31–60
1,001
61–90
6,289
90–180
4,430
180+
51

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 the 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 United States 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, 11,771 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.

Frequently asked

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

RevenueBase identified 2,430 legislative consulting firms headquartered in the 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?

Taft Stettinius & Hollister LLP, headquartered in Indianapolis, 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 11,771 verified decision-maker contacts tracked across these 2,430 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.