Company lists · Data refreshed September 2026

Top 25 Administrative law firms based in Washington, United States

Name: Administrative 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 27, 2026 132 companies tracked

RevenueBase identified 132 administrative law firms headquartered in Washington, United States as of September 2026 and tracks 4,406 professional contacts across them, including 2,722 with verified work emails. Across the United States, New York is the largest hub for this category (230 companies); Washington follows with 132.

This list covers administrative 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 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 27, 2026 86% judged on-target in blind review

132Companies

4,406Contacts tracked

2,722Verified emails

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The 25 largest administrative law firms based in Washington, United States

Ranked by team size

Top 25 of 132 administrative law firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to administrative 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 27, 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 27, 2026
2	Wiley Rein LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
3	Keller And Heckman LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
4	Zuckerman Spaeder LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	155 contacts →
	Indirect evidence “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Source: RevenueBase Database · checked Sep 27, 2026
5	Wilkinson Barker Knauer, LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	138 contacts →
	Partial evidence “With offices in Washington, DC, Denver, Colorado, and Austin, Texas, Wilkinson Barker Knauer (WBK) is the nation’s largest stand-alone communications and technology law firm.” Source: RevenueBase Database · checked Sep 27, 2026
6	Powers LAW	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
7	Holtzman Vogel	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	80 contacts →
	Indirect 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 27, 2026
8	Reno & Cavanaugh, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 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 27, 2026
9	DOW Lohnes	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	201-500	73 contacts →
	Indirect evidence “On January 1, 2014, Dow Lohnes merged with Cooley LLP.” Source: RevenueBase Database · checked Sep 27, 2026
10	HWG LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	70 contacts →
	Partial evidence “HWG LLP is a boutique law firm designed to offer clients access to top tier legal talent without unnecessary overhead.” Source: RevenueBase Database · checked Sep 27, 2026
11	Maggio Kattar Nahajzer Alexander PC	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	55 contacts →
	Partial evidence “Maggio Kattar has been recognized as one of the top Immigration Law firms in the U.S.” Source: RevenueBase Database · checked Sep 27, 2026
12	Olsson Frank Weeda Terman Matz PC	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	49 contacts →
	Partial evidence “Olsson Frank Weeda Terman Matz PC The nation’s premier FDA, USDA, and health care law firm, serving clients before federal agencies, courts, and Congress.” Source: RevenueBase Database · checked Sep 27, 2026
13	Conn Maciel Carey LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	46 contacts →
	Partial evidence “Conn Maciel Carey LLP is a boutique law firm focused on Labor & Employment, Workplace Safety - OSHA/MSHA, and Litigation.” Source: RevenueBase Database · checked Sep 27, 2026
14	Berliner Corcoran & Rowe LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	44 contacts →
	Partial evidence “Berliner Corcoran & Rowe LLP is a boutique law firm focused on international law, export controls/sanctions/customs/OFAC/CFIUS, litigation, corporate and intellectual property law.” Source: RevenueBase Database · checked Sep 27, 2026
15	Peacock Keller, LLP	Partial evidence	Washington, PA, United StatesHQ checked Sep 27, 2026	51-200	38 contacts →
	Partial evidence “Peacock Keller is a full service law firm headquartered in Washington, Pennsylvania.” Source: RevenueBase Database · checked Sep 27, 2026
16	Cooper & Kirk Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	38 contacts →
	Indirect evidence “Cooper & Kirk is a litigation boutique specializing in commercial, regulatory, and constitutional disputes in both federal and state courts.” Source: RevenueBase Database · checked Sep 27, 2026
17	Tiber Hudson LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	36 contacts →
	Partial evidence “Tiber Hudson LLC is a boutique law firm focused in providing legal services including complex commercial litigation, complex commercial transactions, corporate structure and…” Source: RevenueBase Database · checked Sep 27, 2026
18	Federal Practice Group, LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	33 contacts →
	Partial evidence “Federal Practice Group is a nationally recognized law firm specializing in federal employment, military law, government contracts, security clearance, litigation, and more.” Source: RevenueBase Database · checked Sep 27, 2026
19	Sparacino Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	28 contacts →
	Partial evidence “Sparacino PLLC is a high-stakes commercial litigation law firm headquartered in Washington, D.C.” Source: RevenueBase Database · checked Sep 27, 2026
20	Duncan, Weinberg, Genzer & Pembroke, P.C. Dwgp	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	28 contacts →
	Indirect evidence “Since its founding in 1971, DWG & P, has provided a broad range of counseling, regulatory, litigation and legislative services to clients in every region of the country.” Source: RevenueBase Database · checked Sep 27, 2026
21	Cuneo, Gilbert & Laduca, LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	26 contacts →
	Indirect evidence “We practice advocacy-and only advocacy.” Source: RevenueBase Database · checked Sep 27, 2026
22	Stein Mitchell Beato & Missner LLP	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	26 contacts →
	Partial evidence “Stein Mitchell Beato & Missner LLP is a law firm located in Washington, D.C.” Source: RevenueBase Database · checked Sep 27, 2026
23	Weisbrod Matteis & Copley Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	25 contacts →
	Indirect evidence “You can count on Weisbrod Matteis & Copley when the stakes are high.” Source: RevenueBase Database · checked Sep 27, 2026
24	Liles Parker Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	24 contacts →
	Partial evidence “Liles Parker PLLC is a full service law firm that focuses its practice in the regulatory health law space.” Source: RevenueBase Database · checked Sep 27, 2026
25	Schagrin Associates	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	19 contacts →
	Partial evidence “Schagrin Associates was founded in 1984 and aims to address the international trade concerns of our clients through all available legislative, judicial, and administrative avenues.” Source: RevenueBase Database · checked Sep 27, 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: administrative 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 administrative law firms.
Partial evidence: Its own public description names part of administrative law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name administrative 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 132 administrative law firms based in Washington, United States

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Administrative law firms based in Washington, United States at a glance

As of Sep 27, 2026

61.8%Verified-email coverage

33.4Average contacts per company

1-10Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 132 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 administrative 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 “administrative 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 administrative 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 administrative 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, 2,722 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.

Administrative 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 administrative 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 administrative law firms are there based in Washington, United States?

RevenueBase identified 132 administrative 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 administrative law firms?

New York leads the United States with 230 headquartered companies, followed by Washington (132) and Chicago (126).

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 2,722 verified decision-maker contacts tracked across these 132 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.