Company lists · Data refreshed September 2026

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

Name: Nonprofit advocacy law 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 29, 2026 133 companies tracked

RevenueBase identified 133 nonprofit advocacy law firms headquartered in Washington, United States as of September 2026 and tracks 4,542 professional contacts across them, including 2,865 with verified work emails. Across the United States, Washington is the largest hub for this category.

This list covers nonprofit advocacy 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, 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

133Companies

4,542Contacts tracked

2,865Verified emails

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

Ranked by team size

Top 25 of 133 nonprofit advocacy law firms based in Washington, 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	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
2	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
3	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
4	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
5	Zuckerman Spaeder LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	155 contacts →
	Indirect evidence “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Source: RevenueBase Database · checked Sep 29, 2026
6	Elias LAW Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	110 contacts →
	Indirect evidence “We help Democrats win, citizens vote, and progressives make change.” Source: RevenueBase Database · checked Sep 29, 2026
7	Powers LAW	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	101 contacts →
	Partial evidence “Powers Pyles Sutter & Verville PC is a Washington, DC-based law firm that began with a strong focus on healthcare law and healthcare policy and has gradually expanded capabilities…” Source: RevenueBase Database · checked Sep 29, 2026
8	Holtzman Vogel	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	80 contacts →
	Partial evidence “HOLTZMAN VOGEL PROTECTS THE HIGHEST PROFILE VOICES IN BUSINESS, POLITICS AND ADVOCACY For 25 years, Holtzman Vogel has represented Fortune 500 companies, non-profits, high net…” Source: RevenueBase Database · checked Sep 29, 2026
9	Reno & Cavanaugh, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	73 contacts →
	Partial evidence “Since 1977, Reno & Cavanaugh has been a national law firm dedicated to strengthening communities through strategic use of public and private resources.” Source: RevenueBase Database · checked Sep 29, 2026
10	Relman Colfax Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	56 contacts →
	Partial 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 29, 2026
11	Citizens For Responsibility And Ethics In Washington Crew	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	53 contacts →
	Indirect 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 29, 2026
12	Advocacy Associates	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 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 29, 2026
13	Rising For Justice	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 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 29, 2026
14	Continental Strategy	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	35 contacts →
	Indirect evidence “Continental Strategy is a government relations firm with offices in Washington D.C, Tallahassee, Miami, Jacksonville, and Latin America.” Source: RevenueBase Database · checked Sep 29, 2026
15	Waxman Strategies	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	33 contacts →
	Indirect evidence “Waxman is a progressive-minded public affairs firm led by former Representative Henry Waxman, deemed “one of the most accomplished legislators of his or any era” by President…” Source: RevenueBase Database · checked Sep 29, 2026
16	DC Affordable LAW Firm	Strong evidence	Washington, DC, United StatesHQ checked Sep 29, 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 29, 2026
17	Webster, Chamberlain & Bean LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 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 29, 2026
18	Cuneo, Gilbert & Laduca, LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	26 contacts →
	Partial evidence “We practice advocacy-and only advocacy.” Source: RevenueBase Database · checked Sep 29, 2026
19	Trister, Ross, Schadler & Gold, Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	26 contacts →
	Indirect evidence “Trister, Ross, Schadler & Gold, PLLC combines personalized client service with decades of broad experience and specialized legal expertise.” Source: RevenueBase Database · checked Sep 29, 2026
20	Weisbrod Matteis & Copley Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	25 contacts →
	Indirect evidence “You can count on Weisbrod Matteis & Copley when the stakes are high.” Source: RevenueBase Database · checked Sep 29, 2026
21	Miller Strategies, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	21 contacts →
	Partial evidence “Miller Strategies, LLC is a full-service government relations firm dedicated to effective strategy and advocacy, and uniquely positioned to help clients navigate the complexities…” Source: RevenueBase Database · checked Sep 29, 2026
22	Gupta Wessler LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	19 contacts →
	Indirect evidence “Gupta Wessler is the nation's premier plaintiff-side appellate boutique.” Source: RevenueBase Database · checked Sep 29, 2026
23	Terris, Pravlik & Millian, LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	15 contacts →
	Indirect evidence “Terris, Pravlik & Millian, LLP was founded by Bruce J.” Source: RevenueBase Database · checked Sep 29, 2026
24	Fulcrum Public Affairs LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	15 contacts →
	Partial evidence “Fulcrum Public Affairs is a full-service bipartisan government affairs firm specializing in federal relations, state and local advocacy, and stakeholder coalition building.” Source: RevenueBase Database · checked Sep 29, 2026
25	The Campaign Workshop	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	15 contacts →
	Partial evidence “The Campaign Workshop is an award winning advocacy and political advertising agency specializing in strategy, targeted communications and training.” 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 133 nonprofit advocacy law firms based in Washington, United States

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

As of Sep 29, 2026

63.1%Verified-email coverage

34.2Average contacts per company

1-10Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

1,001-5,000

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 133 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 Washington, 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 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, 2,865 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 in the United States

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 Washington, United States?

RevenueBase identified 133 nonprofit advocacy 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 in the United States has the most nonprofit advocacy law firms?

Washington leads the United States 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 2,865 verified decision-maker contacts tracked across these 133 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.