Company lists · Data refreshed September 2026
Top 25 Nonprofit legal advocacy firms based in the United States
RevenueBase identified 1,661 nonprofit legal advocacy firms headquartered in the United States as of September 2026 and tracks 31,059 professional contacts across them, including 13,627 with verified work emails. Washington is the largest hub.
This list covers nonprofit legal advocacy 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 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 legal advocacy firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,012 contacts → | ||||
Indirect 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 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 500 contacts → | ||||
Partial evidence “Brooklyn Defender Services is a public defense office whose mission is to provide outstanding representation and advocacy free of cost to people facing loss of freedom, family…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 388 contacts → | ||||
Indirect evidence “Alexandra Lozano Immigration Law transforms the lives of immigrants and their families!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 378 contacts → | ||||
Partial evidence “Legal Services NYC fights poverty and seeks justice for low-income New Yorkers.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 257 contacts → | ||||
Partial evidence “Legal Aid Foundation of Los Angeles achieves justice for people living in poverty across Los Angeles County.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 247 contacts → | ||||
Partial evidence “Legal Services of New Jersey (LSNJ), an independent, non-profit organization, coordinates the statewide Legal Services system.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 240 contacts → | ||||
Partial 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 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 206 contacts → | ||||
Indirect 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 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 186 contacts → | ||||
Partial evidence “The mission of Legal Services of the Hudson Valley is to provide free, high quality counsel in civil matters for poor and low-income individuals and families who cannot afford to…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 185 contacts → | ||||
Partial evidence “Legal Aid Services of Oklahoma is a non-profit law firm.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 183 contacts → | ||||
Partial 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 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 179 contacts → | ||||
Partial evidence “Bay Area Legal Aid (BayLegal) ensures fairness in the civil justice system for the most vulnerable members of our community.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 174 contacts → | ||||
Partial evidence “Founded in 1974, Bet Tzedek pursues equal justice for all by providing high-quality, free legal services to the unhoused, undocumented immigrants, LGBTQIA+ community, low-wage…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 166 contacts → | ||||
Indirect evidence “Metropolitan Public Defender has been on the cutting edge of public defense since our inception in 1971.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 160 contacts → | ||||
Partial evidence “Pacific Legal Foundation fights for Americans in court against unjust laws and regulations.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 158 contacts → | ||||
Indirect evidence “DiCello Levitt LLP is one of the leading plaintiffs’ law firms in the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 155 contacts → | ||||
Indirect evidence “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 149 contacts → | ||||
Strong evidence “Legal Aid’s mission is to secure justice, equity, and access to opportunity for and with people who have low incomes through passionate legal representation and advocacy for…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 146 contacts → | ||||
Indirect evidence “True pioneers often set out with limited resources, no clear path and no instructions.” 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 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 1,661 nonprofit legal advocacy firms based in the United States
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Nonprofit legal advocacy firms 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 1,661 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 the 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 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, 13,627 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
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 the United States?
RevenueBase identified 1,661 nonprofit legal advocacy 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?
Nelson Mullins Riley & Scarborough, headquartered in Columbia, 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 13,627 verified decision-maker contacts tracked across these 1,661 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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Nonprofit legal advocacy firms by geography
- Nonprofit legal advocacy firms based in Chicago, United States
- Nonprofit legal advocacy firms based in Denver, United States
- Nonprofit legal advocacy firms based in Los Angeles, United States
- Nonprofit legal advocacy firms based in New York, United States
- Nonprofit legal advocacy firms based in San Francisco, United States
- Nonprofit legal advocacy firms based in Washington, United States
- Nonprofit legal advocacy firms based in Australia
- Nonprofit legal advocacy firms based in Brazil
- Nonprofit legal advocacy firms based in Canada
- Nonprofit legal advocacy firms based in the United Kingdom
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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- Nonprofit legal advocacy firms based in Chicago, United States
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- Nonprofit legal advocacy firms based in San Francisco, United States
- Nonprofit legal advocacy firms based in Washington, United States