Company lists · Data refreshed September 2026

Top 25 Nonprofit advocacy law firms based in the United States

Name: Nonprofit advocacy law firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 2,050 companies tracked

RevenueBase identified 2,050 nonprofit advocacy law firms headquartered in the United States as of September 2026 and tracks 40,632 professional contacts across them, including 23,043 with verified work emails. Washington is the largest hub.

This list covers nonprofit advocacy law 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 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 29, 2026 86% judged on-target in blind review

2,050Companies

40,632Contacts tracked

23,043Verified emails

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The 25 largest nonprofit advocacy law firms based in the United States

Ranked by team size

Top 25 of 2,050 nonprofit advocacy law firms based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to nonprofit advocacy law 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	Morgan & Morgan, P.A	Indirect evidence	Orlando, FL, United StatesHQ checked Sep 29, 2026	1,001-5,000	5,016 contacts →
	Indirect evidence “John Morgan became a lawyer with a simple mission: To fight for the people, and not the powerful.” Source: RevenueBase Database · checked Sep 29, 2026
2	Nelson Mullins Riley & Scarborough	Partial evidence	Columbia, SC, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,012 contacts →
	Partial evidence “Established in 1897, Nelson Mullins is an Am Law 100 firm of more than attorneys, policy advisors and professionals with 33 offices in 17 states and Washington, D.C.” Source: RevenueBase Database · checked Sep 29, 2026
3	Taft Stettinius & Hollister LLP	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,980 contacts →
	Indirect evidence “At Taft, we work as one team, driven and committed to helping you succeed.” Source: RevenueBase Database · checked Sep 29, 2026
4	Venable LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,790 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 29, 2026
5	Ballard Spahr LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,682 contacts →
	Partial evidence “Ballard Spahr LLP, an Am Law 100 law firm with more than 750 lawyers in 19 U.S.” Source: RevenueBase Database · checked Sep 29, 2026
6	Saul Ewing LLP	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 29, 2026	501-1,000	916 contacts →
	Indirect evidence “Inspired People.” Source: RevenueBase Database · checked Sep 29, 2026
7	Hall Booth Smith, P.C	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	501-1,000	815 contacts →
	Partial evidence “Established in 1989, Hall Booth Smith, P.C.(HBS) is a full-service law firm with 33 offices across the United States.” Source: RevenueBase Database · checked Sep 29, 2026
8	Adams & Reese	Indirect evidence	U.S., United StatesHQ checked Sep 29, 2026	501-1,000	758 contacts →
	Indirect evidence “At Adams & Reese, we take things personally.” Source: RevenueBase Database · checked Sep 29, 2026
9	Wiley Rein LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 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 29, 2026
10	Singleton Schreiber	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	201-500	343 contacts →
	Indirect evidence “This page contains attorney advertising.” Source: RevenueBase Database · checked Sep 29, 2026
11	Mcnees Wallace & Nurick	Partial evidence	Harrisburg, PA, United StatesHQ checked Sep 29, 2026	201-500	307 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 29, 2026
12	Maryland Legal AID	Strong evidence	Baltimore, MD, United StatesHQ checked Sep 29, 2026	201-500	298 contacts →
	Strong evidence “Maryland Legal Aid (MLA) is a statewide private, nonprofit law firm that provides free, civil legal services to low-income and vulnerable people to address their most fundamental…” Source: RevenueBase Database · checked Sep 29, 2026
13	Neighborhood Legal Services Of LOS Angeles County	Indirect evidence	Glendale, CA, United StatesHQ checked Sep 29, 2026	51-200	240 contacts →
	Indirect evidence “Each year Neighborhood Legal Services of Los Angeles County (NLSLA) provides free assistance to more than individuals and families through innovative projects that expand access…” Source: RevenueBase Database · checked Sep 29, 2026
14	Cohen Milstein Sellers & Toll LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 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 29, 2026
15	Keller And Heckman LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	230 contacts →
	Partial 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 29, 2026
16	California Rural Legal Assistance, INC	Partial evidence	Modesto, CA, United StatesHQ checked Sep 29, 2026	201-500	230 contacts →
	Partial evidence “California Rural Legal Assistance, Inc.(CRLA) is an anti-poverty law firm that dismantles unjust systems through community lawyering in California’s historically rural areas.” Source: RevenueBase Database · checked Sep 29, 2026
17	Northwest Justice Project	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	201-500	226 contacts →
	Partial evidence “As a dynamic statewide law firm, NJP pursues its mission through legal advice and representation, community partnerships, and education to empower clients and combat injustice in…” Source: RevenueBase Database · checked Sep 29, 2026
18	Foster Swift Collins & Smith, PC	Indirect evidence	Lansing, MI, United StatesHQ checked Sep 29, 2026	201-500	222 contacts →
	Indirect evidence “Foster Swift has helped businesses, public entities, families, and individuals navigate legal challenges and discover opportunities across Michigan for more than 120 years.” Source: RevenueBase Database · checked Sep 29, 2026
19	Heplerbroom LLC	Indirect evidence	Edwardsville, IL, United StatesHQ checked Sep 29, 2026	201-500	217 contacts →
	Indirect evidence “HeplerBroom LLC is committed to bringing Excellence, Results, and Integrity to everything we do.” Source: RevenueBase Database · checked Sep 29, 2026
20	Institute For Justice	Partial evidence	Arlington, VA, United StatesHQ checked Sep 29, 2026	51-200	206 contacts →
	Partial evidence “Through strategic litigation, training, communication, activism and research, the Institute for Justice advances a rule of law under which individuals can control their destinies…” Source: RevenueBase Database · checked Sep 29, 2026
21	Milberg	Indirect evidence	Puerto Rico, United StatesHQ checked Sep 29, 2026	51-200	203 contacts →
	Indirect evidence “For over 50 years, Milberg and its affiliates have been protecting victims’ rights and have recovered over $50 billion for our clients.” Source: RevenueBase Database · checked Sep 29, 2026
22	Prairie State Legal Services INC	Strong evidence	Rockford, IL, United StatesHQ checked Sep 29, 2026	51-200	198 contacts →
	Strong evidence “Prairie State Legal Services (PSLS) is a nonprofit law firm, serving 36 counties throughout Northern and Central Illinois.” Source: RevenueBase Database · checked Sep 29, 2026
23	Liebert Cassidy Whitmore	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 29, 2026	51-200	188 contacts →
	Partial evidence “Liebert Cassidy Whitmore serves as trusted advisors to public agencies, educational institutions, and nonprofits across California.” Source: RevenueBase Database · checked Sep 29, 2026
24	Legal AID Services Of Oklahoma	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 29, 2026	51-200	185 contacts →
	Partial evidence “Legal Aid Services of Oklahoma is a non-profit law firm.” Source: RevenueBase Database · checked Sep 29, 2026
25	Public Counsel	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 29, 2026	51-200	183 contacts →
	Strong evidence “Public Counsel is a nonprofit public interest law firm dedicated to advancing civil rights and racial and economic justice, as well as to amplifying the power of our clients…” Source: RevenueBase Database · checked Sep 29, 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 advocacy law 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 advocacy law firms.
Partial evidence: Its own public description names part of nonprofit advocacy law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name nonprofit advocacy law 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 2,050 nonprofit advocacy law firms based in the United States

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Nonprofit advocacy law firms based in the United States at a glance

As of Sep 29, 2026

56.7%Verified-email coverage

19.8Average contacts per company

1-10Median size (employees)

6.5%Largest-city concentration · Washington

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

1,373

11-50

511

51-200

137

201-500

501-1,000

1,001-5,000

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 2,050 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 law 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 the United States whose own description of what they do matches “nonprofit advocacy law 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 advocacy law 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 advocacy law 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 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, 23,043 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 29, 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 law firms by metro

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 law 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 advocacy law firms are there based in the United States?

RevenueBase identified 2,050 nonprofit advocacy law 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?

Morgan & Morgan, P.A, headquartered in Orlando, tops this list with the largest team on record.

Which city has the most nonprofit advocacy law firms?

Washington leads with 133 headquartered companies, followed by New York (83) and Chicago (55).

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 23,043 verified decision-maker contacts tracked across these 2,050 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 29, 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.