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 advocacy organizations consulting firms headquartered in 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 advocacy organizations 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 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 27, 2026 86% judged on-target in blind review

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 advocacy organizations consulting firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to advocacy organizations consulting 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	APCO	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,578 contacts →
	Partial evidence “APCO is a global advisory and advocacy firm helping organizations build the un/common ground upon which progress is made.” Source: RevenueBase Database · checked Sep 27, 2026
2	Wiley Rein LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
3	DDC Public Affairs	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	411 contacts →
	Partial evidence “DDC Public Affairs builds communities of advocates that impact policy and win campaigns.” Source: RevenueBase Database · checked Sep 27, 2026
4	Bully Pulpit International	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	282 contacts →
	Indirect evidence “Bully Pulpit International (BPI) is an outcomes agency at the intersection of business, politics, and policy.” Source: RevenueBase Database · checked Sep 27, 2026
5	TCG	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	263 contacts →
	Indirect evidence “Traditional we are not.” Source: RevenueBase Database · checked Sep 27, 2026
6	Cornerstone Government Affairs	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	201-500	255 contacts →
	Indirect 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 27, 2026
7	BGR Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	243 contacts →
	Partial 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 27, 2026
8	Cohen Milstein Sellers & Toll LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	236 contacts →
	Indirect evidence “Cohen Milstein Sellers & Toll LLP champions the causes of real people-workers, consumers, small business owners, investors, and whistleblowers-working to deliver corporate reforms…” Source: RevenueBase Database · checked Sep 27, 2026
9	Keller And Heckman LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
10	Missionwired	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	201-500	226 contacts →
	Indirect evidence “At MissionWired, we believe your world-changing cause deserves more than marginal gains.” Source: RevenueBase Database · checked Sep 27, 2026
11	SKDK	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	220 contacts →
	Partial 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 27, 2026
12	M R	Indirect evidence	Washington, United StatesHQ checked Sep 27, 2026	51-200	208 contacts →
	Indirect evidence “We are M+R.” Source: RevenueBase Database · checked Sep 27, 2026
13	AVŌQ	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	201-500	205 contacts →
	Indirect evidence “Excellence isn’t enough.” Source: RevenueBase Database · checked Sep 27, 2026
14	DCI	Strong evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	198 contacts →
	Strong 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 27, 2026
15	Mcallister & Quinn	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
16	Invariant	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
17	Rational 360	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	161 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 27, 2026
18	Zuckerman Spaeder LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	155 contacts →
	Indirect evidence “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Source: RevenueBase Database · checked Sep 27, 2026
19	Herren Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	142 contacts →
	Indirect evidence “Here at Herren, our goals are to drive efficiency and maximize the value of every dollar our clients spend.” Source: RevenueBase Database · checked Sep 27, 2026
20	National Journal	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	124 contacts →
	Partial 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 27, 2026
21	Public & Government Affairs At Edelman	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	201-500	121 contacts →
	Indirect 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 27, 2026
22	Narrative Strategies	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	111 contacts →
	Indirect evidence “Narrative is a full-service strategic communications firm creatively solving today’s most demanding reputational and public affairs challenges.” Source: RevenueBase Database · checked Sep 27, 2026
23	The Cohen Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	110 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 27, 2026
24	Powers LAW	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	101 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 27, 2026
25	VOX Global	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	99 contacts →
	Indirect evidence “It starts with a goal: yours.” Source: RevenueBase Database · checked Sep 27, 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: advocacy organizations consulting 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 advocacy organizations consulting firms.
Partial evidence: Its own public description names part of advocacy organizations consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name advocacy organizations consulting 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 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

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among advocacy organizations consulting 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 “advocacy organizations consulting 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 advocacy organizations consulting 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 advocacy organizations 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 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, 8,589 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 27, 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.

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

RevenueBase identified 1,296 advocacy organizations 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?

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

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

Washington leads the United States with 1,296 headquartered companies, followed by New York (600) and Chicago (327).

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 8,589 verified decision-maker contacts tracked across these 1,296 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 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 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.