Company lists · Data refreshed September 2026
Top 25 Nonprofit law firms based in Washington, United States
RevenueBase identified 63 nonprofit law firms headquartered in Washington, United States as of September 2026 and tracks 2,669 professional contacts across them, including 1,727 with verified work emails. Washington is the largest hub.
This list covers nonprofit law 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 law firms based in Washington, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,790 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 227 | ||||
“Arabella Advisors is a professional services firm that provides administrative, operational, and strategic support to nonprofits, foundations, and individual donors.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 73 | ||||
“Since 1977, Reno & Cavanaugh has been a national law firm dedicated to strengthening communities through strategic use of public and private resources.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 72 | ||||
“At Equal Justice Works, we believe that a community of lawyers committed to public service can fulfill our nation’s promise of equal justice for all.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Rising For JusticeIndirect evidence | 49 | |||
“At Rising for Justice, we believe everyone deserves justice-today, tomorrow and always.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 46 | ||||
“The D.C.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 28 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Webster, Chamberlain & Bean LLPPartial evidence | 27 | |||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | Cuneo, Gilbert & Laduca, LLPIndirect evidence | 26 | |||
“We practice advocacy-and only advocacy.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | Trister, Ross, Schadler & Gold, PllcIndirect evidence | 26 | |||
“Trister, Ross, Schadler & Gold, PLLC combines personalized client service with decades of broad experience and specialized legal expertise.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | Summit Legal AIDPartial evidence | 25 | |||
“Summit Legal Aid is a nonprofit organization dedicated to ensuring equal access to justice for vulnerable residents in a 10-county region.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | PRO Bono InstitutePartial evidence | 15 | |||
“Founded in 1996, the Pro Bono Institute (PBI) is a Washington, D.C-based nonprofit organization.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | Tenenbaum LAW Group PllcStrong evidence | 12 | |||
“Tenenbaum Law Group PLLC is a nationally recognized, eight-attorney boutique Washington, DC-based law firm specializing in the representation of nonprofit organizations.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | Watkinson Miller PllcPartial evidence | 12 | |||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | Napa LegalPartial evidence | 12 | |||
“Napa Legal is changing the game for faith-based nonprofits.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | Klamp & Associates, P.CPartial evidence | 11 | |||
“Klamp & Associates is a law firm dedicated exclusively to representing charitable organizations.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | Sandler Reiff Lamb Rosenstein & Birkenstock, P.CIndirect evidence | 9 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 9 | ||||
“For more than forty years, we at Harmon, Curran, Spielberg + Eisenberg, LLP, have served the legal needs of individuals and organizations to help them advance social, economic and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | LEX Mundi PRO Bono FoundationStrong evidence | 8 | |||
“The Lex Mundi Pro Bono Foundation is a 501(c)(3) nonprofit affiliate of Lex Mundi, the world’s leading association of independent law firms.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | O Riordan Bethel LAW Firm, LLPIndirect evidence | 7 | |||
“Nationally-recognized and award-winning economists, lawyers and public policy experts providing public policy analysis; business process improvement; research and analysis…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Feldesman Leifer LLPIndirect evidence | 5 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | LPJ Legal PllcPartial evidence | 5 | |||
“LPJ Legal counsel small business owners, start-ups, entrepreneurs, and nonprofits.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 | ||||
“Garner Law PLLC is a small law firm with its focus on providing passionate, dedicated representation to clients in Maryland and the District of Columbia.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 3 | ||||
“DC Refers was created to increase access to justice for persons of modest means in the District of Columbia.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Tuffin Reilly PllcPartial evidence | 2 | |||
“Tuffin Reilly PLLC is the only boutique law firm in Washington, D.C.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 63 nonprofit law firms based in Washington, United States
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Nonprofit law firms based in Washington, United States at a glance
As of Sep 5, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 63 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 law firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 law firms”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among nonprofit law 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 an evidence 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, 1,727 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 5, 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 law firms by metro in the United States
- Nonprofit law firms in Washington63
- Nonprofit law firms in New York62
- Nonprofit law firms in Chicago44
- Nonprofit law firms in Los Angeles37
- Nonprofit law firms in Houston31
- Nonprofit law firms in San Francisco28
Frequently asked
How many nonprofit law firms are there based in Washington, United States?
RevenueBase identified 63 nonprofit law 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?
Venable LLP, headquartered in Washington, tops this list with the largest team on record.
Which city has the most nonprofit law firms?
Washington leads with 63 headquartered companies, followed by New York (62) and Chicago (44).
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 1,727 verified decision-maker contacts tracked across these 63 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 5, 2026.
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Nonprofit law firms by geography
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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 SmartSearch, 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.