Company lists · Data refreshed September 2026
Top 25 Nonprofit advocacy organizations based in the United States
RevenueBase identified 243 nonprofit advocacy organizations headquartered in the United States as of September 2026 and tracks 3,132 professional contacts across them, including 1,207 with verified work emails. Washington is the largest hub.
This list covers nonprofit advocacy organizations 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, 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.
The 25 largest nonprofit advocacy organizations based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 119 contacts → | ||||
Indirect evidence “We are activists and members throughout the state.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 79 contacts → | ||||
Partial evidence “PIRG is an advocate for the public interest.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 72 contacts → | ||||
Indirect evidence “TFN is a statewide non-partisan, grassroots organization that is building an informed and effective movement working toward equality and social justice.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 69 contacts → | ||||
Partial evidence “For more than 50 years, Advocates for Children of New York has played an important and unique role in New York's public education community.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 67 contacts → | ||||
Indirect evidence “The Hub Project is a Washington D.C.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 64 contacts → | ||||
Indirect evidence “The Hunt Institute is a strategic catalyst for transforming public education and securing our country’s future.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 62 contacts → | ||||
Indirect evidence “Citizen Action of New York is a grassroots membership organization taking on big issues that are at the center of transforming American society.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 61 contacts → | ||||
Indirect evidence “Every day, children are harmed by America’s child welfare, juvenile justice, immigration, education, and healthcare systems.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 58 contacts → | ||||
Indirect evidence “Alliance for Justice is a national association of over 120 organizations, representing a broad array of groups committed to progressive values and the creation of an equitable…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 58 contacts → | ||||
Partial evidence “Mission: CLASP's mission is to develop and advocate for policies at the federal, state and local levels that improve the lives of low income people.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 53 contacts → | ||||
Indirect evidence “At CREW, we use aggressive legal actions, in-depth investigations, and innovative policy and reform work to achieve that vision.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 52 contacts → | ||||
Indirect evidence “Our kids deserve a future where they can reach their full potential with no limitations.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 51 contacts → | ||||
Partial evidence “Washington Conservation Action’s mission is to advocate for environmental progress and justice through actions that mobilize the public, elect champions for the environment, and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 51 contacts → | ||||
Partial evidence “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: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 48 contacts → | ||||
Partial evidence “Ohio Citizen Action organizes and mobilizes people to advocate for public interests.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 47 contacts → | ||||
Indirect evidence “We have fought for more than 40 years to protect civil rights and achieve lived equality for communities in need.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 45 contacts → | ||||
Indirect evidence “VPIRG’s mission is to promote and protect the health of Vermont’s people, environment and locally-based economy by informing and mobilizing individuals and communities across the…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 44 contacts → | ||||
Partial evidence “ONE POWERFUL FORCE UNITED TOGETHER ~ WE LEGISLATE, EDUCATE, ADVOCATE DECISION MAKERS FOR THE IMPROVED QUALITY-OF-LIFE AND ECONOMIC FAIRNESS TO SUPPORT THE WELL-BEING OF MILITARY…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 33 contacts → | ||||
Indirect evidence “Because we want to create a better society for our children and for their children, we are devoted to raising funds for organizations that promote the values we believe in.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 29 contacts → | ||||
Indirect evidence “The League of Women Voters, a nonpartisan political organization, encourages informed and active participation in government, works to increase understanding of major public…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 25 contacts → | ||||
Partial evidence “Professional Advocacy.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 22 contacts → | ||||
Indirect evidence “No single organization can win alone.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
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: nonprofit 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 nonprofit advocacy organizations.
- Partial evidence
- Its own public description names part of nonprofit advocacy organizations, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name nonprofit 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 243 nonprofit advocacy organizations based in the United States
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Nonprofit advocacy organizations based in the United States at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 243 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 nonprofit 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 the United States whose own description of what they do matches “nonprofit 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 nonprofit 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 nonprofit advocacy organizations, 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 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, 1,207 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.
Nonprofit advocacy organizations by metro
- Nonprofit advocacy organizations in Washington37
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 nonprofit 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 nonprofit advocacy organizations are there based in the United States?
RevenueBase identified 243 nonprofit advocacy organizations 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?
League Of Women Voters, headquartered in Washington, tops this list with the largest team on record.
Which city has the most nonprofit advocacy organizations?
Washington leads with 37 headquartered companies, followed by Boston (9) and New York (9).
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 1,207 verified decision-maker contacts tracked across these 243 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.
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