Company lists · Data refreshed September 2026

Top 25 Nonprofit legal advocacy firms based in Washington, United States

Name: Nonprofit legal advocacy 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 20, 2026 80 companies tracked

RevenueBase identified 80 nonprofit legal advocacy firms headquartered in Washington, United States as of September 2026 and tracks 1,609 professional contacts across them, including 750 with verified work emails. Washington is the largest hub.

This list covers nonprofit legal advocacy 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 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

80Companies

1,609Contacts tracked

750Verified emails

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The 25 largest nonprofit legal advocacy firms based in Washington, United States

Ranked by team size

Top 25 of 80 nonprofit legal advocacy firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to nonprofit legal advocacy 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	Cohen Milstein Sellers & Toll LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 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 20, 2026
2	Zuckerman Spaeder LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	155 contacts →
	Indirect evidence “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Source: RevenueBase Database · checked Sep 20, 2026
3	Relman Colfax Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	56 contacts →
	Indirect evidence “Relman Colfax PLLC is a national civil rights law firm, with a litigation practice focused on combating discrimination and obtaining equity, including in the areas of housing…” Source: RevenueBase Database · checked Sep 20, 2026
4	National Disability Rights Network	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	56 contacts →
	Strong evidence “The National Disability Rights Network (NDRN) is the nonprofit membership organization for the federally mandated Protection and Advocacy (P&A) Systems and Client Assistance…” Source: RevenueBase Database · checked Sep 20, 2026
5	Citizens For Responsibility And Ethics In Washington Crew	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	53 contacts →
	Partial 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, 2026
6	Advocacy Associates	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	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, 2026
7	Rising For Justice	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	49 contacts →
	Indirect evidence “At Rising for Justice, we believe everyone deserves justice-today, tomorrow and always.” Source: RevenueBase Database · checked Sep 20, 2026
8	National Legal AID & Defender Association	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	43 contacts →
	Strong evidence “National Legal Aid & Defender Association (NLADA), founded in 1911, is America’s oldest and largest nonprofit association devoted to excellence in the delivery of legal services…” Source: RevenueBase Database · checked Sep 20, 2026
9	Tzedek DC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	31 contacts →
	Partial evidence “Drawing from the Jewish teachings of “Tzedek, tzedek tirdof,” or “Justice, justice you shall pursue,” Tzedek DC’s mission is to safeguard the legal rights and financial health of…” Source: RevenueBase Database · checked Sep 20, 2026
10	DC Affordable LAW Firm	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Strong evidence “DC Affordable Law Firm ("DCALF") is a nonprofit law firm in Washington, DC providing accessible and affordable family law, immigration, and probate legal services to hardworking…” Source: RevenueBase Database · checked Sep 20, 2026
11	Webster, Chamberlain & Bean LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial evidence “Webster, Chamberlain & Bean, LLP is the leading law firm in the United States specializing in the provision of a full range of legal services to tax-exempt organizations.” Source: RevenueBase Database · checked Sep 20, 2026
12	Cuneo, Gilbert & Laduca, LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	26 contacts →
	Partial evidence “We practice advocacy-and only advocacy.” Source: RevenueBase Database · checked Sep 20, 2026
13	Trister, Ross, Schadler & Gold, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	26 contacts →
	Partial evidence “Trister, Ross, Schadler & Gold, PLLC combines personalized client service with decades of broad experience and specialized legal expertise.” Source: RevenueBase Database · checked Sep 20, 2026
14	Summit Legal AID	Strong evidence	Washington, PA, United StatesHQ checked Sep 20, 2026	51-200	25 contacts →
	Strong evidence “Summit Legal Aid is a nonprofit organization dedicated to ensuring equal access to justice for vulnerable residents in a 10-county region.” Source: RevenueBase Database · checked Sep 20, 2026
15	Gupta Wessler LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “Gupta Wessler is the nation's premier plaintiff-side appellate boutique.” Source: RevenueBase Database · checked Sep 20, 2026
16	The Washington Legal Clinic For The Homeless	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	18 contacts →
	Partial evidence “The Washington Legal Clinic for the Homeless envisions a just and inclusive community for all residents of the District of Columbia, where housing is a human right and where every…” Source: RevenueBase Database · checked Sep 20, 2026
17	Terris, Pravlik & Millian, LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	15 contacts →
	Indirect evidence “Terris, Pravlik & Millian, LLP was founded by Bruce J.” Source: RevenueBase Database · checked Sep 20, 2026
18	Lobbyit	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	14 contacts →
	Indirect evidence “Critically acclaimed and nationally recognized, LobbyIt.com works on a completely different business model than other federal lobbying firms.” Source: RevenueBase Database · checked Sep 20, 2026
19	Tenenbaum LAW Group Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	12 contacts →
	Partial evidence “Tenenbaum Law Group PLLC is a nationally recognized, eight-attorney boutique Washington, DC-based law firm specializing in the representation of nonprofit organizations.” Source: RevenueBase Database · checked Sep 20, 2026
20	Watkinson Miller Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	12 contacts →
	Indirect evidence “WATKINSON MILLER PLLC is a law practice company based out of 1100 New Jersey Ave SE Suite 910, WASHINGTON, District of Columbia, United States.” Source: RevenueBase Database · checked Sep 20, 2026
21	Handley Farah & Anderson Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1-10	11 contacts →
	Indirect evidence “We are lawyers who seek to improve the world.” Source: RevenueBase Database · checked Sep 20, 2026
22	Klamp & Associates, P.C	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1-10	11 contacts →
	Indirect evidence “Klamp & Associates is a law firm dedicated exclusively to representing charitable organizations.” Source: RevenueBase Database · checked Sep 20, 2026
23	National Association Of Consumer Advocates	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1-10	10 contacts →
	Partial evidence “The National Association of Consumer Advocates (NACA) is a nationwide organization of more than 1500 members who represent and have represented hundreds of thousands of consumers…” Source: RevenueBase Database · checked Sep 20, 2026
24	Sandler Reiff Lamb Rosenstein & Birkenstock, P.C	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
25	National Student Legal Defense Network	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1-10	9 contacts →
	Strong evidence “The National Student Legal Defense Network (“Student Defense”) is a non-profit organization that works, through litigation and advocacy, to advance students' rights to educational…” Source: RevenueBase Database · checked Sep 20, 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: nonprofit legal advocacy 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 nonprofit legal advocacy firms.
Partial evidence: Its own public description names part of nonprofit legal advocacy firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name nonprofit legal advocacy 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 80 nonprofit legal advocacy firms based in Washington, United States

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Nonprofit legal advocacy firms based in Washington, United States at a glance

As of Sep 20, 2026

46.6%Verified-email coverage

20.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · Washington

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

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 80 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 legal advocacy 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 “nonprofit legal advocacy 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 nonprofit legal advocacy 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 nonprofit legal advocacy 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, 750 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 legal advocacy firms by metro in the United States

Nonprofit legal advocacy firms in Washington80
Nonprofit legal advocacy firms in New York75
Nonprofit legal advocacy firms in Chicago52
Nonprofit legal advocacy firms in Los Angeles43
Nonprofit legal advocacy firms in Denver32
Nonprofit legal advocacy firms in San Francisco32

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 legal advocacy 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 nonprofit legal advocacy firms are there based in Washington, United States?

RevenueBase identified 80 nonprofit legal advocacy 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?

Cohen Milstein Sellers & Toll LLP, headquartered in Washington, tops this list with the largest team on record.

Which city has the most nonprofit legal advocacy firms?

Washington leads with 80 headquartered companies, followed by New York (75) and Chicago (52).

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 750 verified decision-maker contacts tracked across these 80 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.