Company lists · Data refreshed September 2026

Top 25 Advocacy organizations based in Washington, United States

Name: Advocacy organizations 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 290 companies tracked

RevenueBase identified 290 advocacy organizations headquartered in Washington, United States as of September 2026 and tracks 8,315 professional contacts across them, including 3,349 with verified work emails. Washington is the largest hub.

This list covers advocacy organizations 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

290Companies

8,315Contacts tracked

3,349Verified emails

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The 25 largest advocacy organizations based in Washington, United States

Ranked by team size

Top 25 of 290 advocacy organizations 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 advocacy organizations: 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	DDC Public Affairs	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	411 contacts →
	Strong evidence “DDC Public Affairs builds communities of advocates that impact policy and win campaigns.” Source: RevenueBase Database · checked Sep 19, 2026
2	The ONE Campaign	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	410 contacts →
	Indirect evidence “ONE is a global nonpartisan organization fighting for a more just world by demanding the investments needed to create economic opportunities and healthier lives in Africa.” Source: RevenueBase Database · checked Sep 19, 2026
3	League Of Women Voters	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	n/a	375 contacts →
	Indirect evidence “The League of Women Voters of the United States encourages informed and active participation in government, works to increase understanding of major public policy issues, and…” Source: RevenueBase Database · checked Sep 19, 2026
4	BGR Group	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 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 19, 2026
5	GMMB	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	201-500	239 contacts →
	Indirect evidence “We’re bold.” Source: RevenueBase Database · checked Sep 19, 2026
6	Cohen Milstein Sellers & Toll LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 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 19, 2026
7	Missionwired	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 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 19, 2026
8	League Of Conservation Voters	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	218 contacts →
	Indirect evidence “LCV believes our earth is worth fighting for because everyone has a right to clean air, water, and a safe, healthy community.” Source: RevenueBase Database · checked Sep 19, 2026
9	St. John's Community Services	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	501-1,000	211 contacts →
	Indirect evidence “SJCS is different from other agencies.” Source: RevenueBase Database · checked Sep 19, 2026
10	AVŌQ	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	201-500	205 contacts →
	Indirect evidence “Excellence isn’t enough.” Source: RevenueBase Database · checked Sep 19, 2026
11	Public Citizen	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	195 contacts →
	Strong evidence “Public Citizen is a nonprofit consumer advocacy organization that champions the public interest – your interests – in the halls of power.” Source: RevenueBase Database · checked Sep 19, 2026
12	National Association For Home Care & Hospice NOW The National Alliance For Care At Home	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	n/a	153 contacts →
	Strong evidence “The National Alliance for Care at Home (the Alliance) brings together the two largest organizations representing, advocating for, educating, and connecting providers of care in…” Source: RevenueBase Database · checked Sep 19, 2026
13	American Association For Justice	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	151 contacts →
	Indirect evidence “The American Association for Justice works to make sure people have a fair chance to receive justice through the legal system when they are injured by the negligence or misconduct…” Source: RevenueBase Database · checked Sep 19, 2026
14	Reproductive Freedom For ALL	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	141 contacts →
	Indirect evidence “For over 50 years, our organization and members have unapologetically helped lead the charge on both the state and national levels to protect and advance reproductive freedom…” Source: RevenueBase Database · checked Sep 19, 2026
15	NO Patient Left Behind	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	n/a	130 contacts →
	Indirect evidence “We believe it is possible for Americans to be able to afford the medicines of today and tomorrow.” Source: RevenueBase Database · checked Sep 19, 2026
16	Indivisible Project	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	123 contacts →
	Indirect evidence “Our mission is to resist Trump’s agenda by empowering local activist groups to make their Members of Congress listen.” Source: RevenueBase Database · checked Sep 19, 2026
17	Results And Results Educational Fund	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	99 contacts →
	Indirect evidence “RESULTS is a movement of passionate, committed everyday people.” Source: RevenueBase Database · checked Sep 19, 2026
18	Global Health Advocacy Incubator	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	97 contacts →
	Strong evidence “The Global Health Advocacy Incubator supports civil society organizations that advocate for public health policies that reduce death and disease.” Source: RevenueBase Database · checked Sep 19, 2026
19	The Leadership Conference On Civil And Human Rights	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	97 contacts →
	Indirect evidence “The Leadership Conference on Civil and Human Rights is a diverse coalition of more than 240 organizations representing the majority of America.” Source: RevenueBase Database · checked Sep 19, 2026
20	Center For Science In The Public Interest	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	89 contacts →
	Strong evidence “The Center for Science in the Public Interest (CSPI) is a non-profit health-advocacy group based in Washington, DC, that focuses on nutrition and food safety.” Source: RevenueBase Database · checked Sep 19, 2026
21	League Of American Bicyclists	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	89 contacts →
	Indirect evidence “The League represents bicyclists in the movement to create safer roads, stronger communities and a Bicycle Friendly America for everyone.” Source: RevenueBase Database · checked Sep 19, 2026
22	America Votes	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	80 contacts →
	Indirect evidence “America Votes is the coordination hub of the progressive community.” Source: RevenueBase Database · checked Sep 19, 2026
23	National Congress Of American Indians	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	76 contacts →
	Indirect evidence “Founded in 1944, the National Congress of American Indians is the oldest, largest and most representative American Indian and Alaska Native organization in the country.” Source: RevenueBase Database · checked Sep 19, 2026
24	Families USA	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	73 contacts →
	Indirect evidence “For more than 30 years, Families USA has been the trusted voice for America’s health care consumers.” Source: RevenueBase Database · checked Sep 19, 2026
25	Thorn RUN Partners	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 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 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: advocacy organizations. 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.
Partial evidence: Its own public description names part of advocacy organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name advocacy organizations. 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 290 advocacy organizations based in Washington, United States

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Advocacy organizations based in Washington, United States at a glance

As of Sep 19, 2026

40.3%Verified-email coverage

28.7Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

168

11-50

51-200

201-500

501-1,000

10001+

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 290 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, 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”. 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), 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, 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, 3,349 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.

Advocacy organizations by metro in the United States

Advocacy organizations in Washington290
Advocacy organizations in New York71
Advocacy organizations in Sacramento47
Advocacy organizations in Los Angeles42
Advocacy organizations in Boston38
Advocacy organizations in Chicago37
Advocacy organizations in Denver36
Advocacy organizations in Austin32
Advocacy organizations in Atlanta30
Advocacy organizations in Phoenix26
Advocacy organizations in San Francisco25

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, 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 are there based in Washington, United States?

RevenueBase identified 290 advocacy organizations 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?

DDC Public Affairs, headquartered in Washington, tops this list with the largest team on record.

Which city has the most advocacy organizations?

Washington leads with 290 headquartered companies, followed by New York (71) and Sacramento (47).

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 3,349 verified decision-maker contacts tracked across these 290 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.