Company lists · Data refreshed September 2026
Top 25 501c3 law firms based in the United States
RevenueBase identified 1,148 501c3 law firms headquartered in the United States as of September 2026 and tracks 12,824 professional contacts across them, including 6,476 with verified work emails. New York is the largest hub.
This list covers 501c3 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 27, 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 501c3 law firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 482 contacts → | ||||
Indirect evidence “At Reinhart Boerner Van Deuren, we know that every trusted relationship begins with understanding.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 298 contacts → | ||||
Partial 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 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 288 contacts → | ||||
Indirect evidence “Since 1938, Connell Foley LLP has been unwavering in its commitment to meeting the needs of clients, employees, and the community while maintaining the highest ethical standards…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 273 contacts → | ||||
Partial evidence “Chisholm Chisholm & Kilpatrick LTD is a law firm offering an array of highly effective services tailored to clients’ needs in the areas of Veterans Law, Long-Term Disability &…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 262 contacts → | ||||
Indirect evidence “As a national full-service accounting and advisory firm exclusively serving nonprofit organizations, CapinCrouse provides professional solutions to organizations whose outcomes…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 198 contacts → | ||||
Partial evidence “Prairie State Legal Services (PSLS) is a nonprofit law firm, serving 36 counties throughout Northern and Central Illinois.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 185 contacts → | ||||
Partial evidence “Legal Aid Services of Oklahoma is a non-profit law firm.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 179 contacts → | ||||
Indirect 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 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 142 contacts → | ||||
Indirect evidence “Established in 1958, Legal Aid Center of Southern Nevada is a private, non-profit, 501(c)(3) organization that ensures equal access to justice through free legal advice and…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 136 contacts → | ||||
Indirect evidence “For one hundred years, Best & Flanagan attorneys have been building uniquely close relationships with our clients, including closely-held businesses, nonprofits, generations of…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 136 contacts → | ||||
Partial evidence “Mid-Minnesota Legal Aid (MMLA) is a nonprofit law firm, providing free legal advice and representation on civil law matters to people of limited income, people with disabilities…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 133 contacts → | ||||
Partial evidence “Lakeshore Legal Aid (LLA) is a not-for-profit law firm providing a range of free civil legal services to low-income people, seniors, and survivors of domestic violence and sexual…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 130 contacts → | ||||
Indirect evidence “Community Legal Services (CLS) has approximately 110 lawyers, advocates, and support staff working to provide civil legal aid for low to moderate income residents in Central…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 122 contacts → | ||||
Indirect evidence “Founded in 1844, Eastman & Smith is a leading consultant, counselor and advocate on personal, business, nonprofit and governmental challenges.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 118 contacts → | ||||
Indirect evidence “COLEMAN, CHAVEZ, & ASSOCIATES LLP is a legal services company based out of 1731 E.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 118 contacts → | ||||
Indirect evidence “Established in 1912 and serving more than individuals annually, the Legal Aid Bureau of Buffalo is the largest and oldest provider of indigent legal services in Western New York.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 115 contacts → | ||||
Indirect evidence “Legal Services Alabama (LSA) serves low-income people by providing civil legal aid and by promoting collaboration to find solutions to problems of poverty from eight offices…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 112 contacts → | ||||
Partial evidence “Bay Area Legal Services is a nonprofit, public interest law firm.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 111 contacts → | ||||
Indirect evidence “Halloran Sage provides responsive legal counsel to client needs.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 108 contacts → | ||||
Partial evidence “Experienced, dedicated, and thoughtful legal counsel for over four decades has made us one of the largest law firms in the state of Oklahoma.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 106 contacts → | ||||
Indirect evidence “Legal Services of North Florida (LSNF) is a private non-profit corporation dedicated to providing free legal representation to low income people with civil legal problems.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 99 contacts → | ||||
Partial evidence “Legal Aid is a non-profit law firm serving Ohioans in Columbiana, Mahoning, Medina, Portage, Stark, Summit, Trumbull, and Wayne Counties.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 98 contacts → | ||||
Indirect evidence “We are down-to-earth professionals who successfully combine the diverse disciplines and skills of a large firm with the accessibility and personalized manner of a small firm.” Source: RevenueBase Database · checked Sep 27, 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: 501c3 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 501c3 law firms.
- Partial evidence
- Its own public description names part of 501c3 law firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name 501c3 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 1,148 501c3 law firms based in the United States
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501c3 law firms based in the United States at a glance
As of Sep 27, 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 1,148 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 501c3 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 “501c3 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 501c3 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 501c3 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, 6,476 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 27, 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.
501c3 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 501c3 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 501c3 law firms are there based in the United States?
RevenueBase identified 1,148 501c3 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?
Nelson Mullins Riley & Scarborough, headquartered in Columbia, tops this list with the largest team on record.
Which city has the most 501c3 law firms?
New York leads with 36 headquartered companies, followed by Washington (32) and Chicago (22).
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 6,476 verified decision-maker contacts tracked across these 1,148 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 27, 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.