Company lists · Data refreshed September 2026

Top 25 Regulatory law firms based in Washington, United States

Name: Regulatory 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 302 companies tracked

RevenueBase identified 302 company matches for regulatory law firms associated with Washington, United States as of September 2026 and tracks 21,834 professional contacts across them, including 13,073 with verified work emails. Across the United States, New York is the largest hub for this category (432 companies); Washington follows with 302.

This list covers company matches for regulatory law firms associated with Washington, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 29, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 29, 2026 How this list was built

302Companies

21,834Contacts tracked

13,073Verified emails

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

Ranked by team size

Top 25 of 302 company matches for regulatory law firms based in Washington, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Arnold & Porter	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	1,001-5,000	2,333 contacts →
	Exact match “Arnold & Porter combines sophisticated regulatory, litigation, and transactional capabilities to resolve clients’ most complex issues.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
2	Bakerhostetler	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	1,001-5,000	2,073 contacts →
	Exact match “Recognized as one of the top firms for client service and quality of legal services, BakerHostetler is a leading law firm that helps clients around the world address their most…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
3	Venable LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	1,001-5,000	1,790 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
4	Crowell & Moring	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	1,001-5,000	1,602 contacts →
	Exact match “Crowell & Moring is an international law firm with operations in the United States, Europe, MENA, and Asia.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5	Wiley Rein LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	501-1,000	576 contacts →
	Exact match “Founded in 1983, Wiley is a dominant presence in the nation’s capital.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
6	Beveridge & Diamond PC	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	201-500	328 contacts →
	Exact match “Beveridge & Diamond’s 170+ lawyers in 7 U.S.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
7	Dickstein Shapiro LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	501-1,000	292 contacts →
	Exact match “Dickstein Shapiro LLP, Market Leading Specialty Firm (SM), is internationally recognized for its work with clients, from start-ups to Fortune 500 corporations.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	Hausfeld	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	201-500	267 contacts →
	Exact match “Hausfeld successfully resolves disputes for its clients, driven by its bold approach and pioneering experience.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9	Keller And Heckman LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	230 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
10	VAN Ness Feldman LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	174 contacts →
	Exact match “Van Ness Feldman is a nationally recognized mid-sized law firm specializing in the areas of energy, environment, and natural resources law and policy, with offices in Washington…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
11	Zuckerman Spaeder LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	155 contacts →
	Exact match “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
12	Wilkinson Barker Knauer, LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	138 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
13	Jackson & Campbell, P.C	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	129 contacts →
	Exact match “For more than 130 years, Jackson & Campbell has been the law firm to which local, regional, and national businesses, associations, and Washingtonians turn for skilled and…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14	Hollingsworth LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	112 contacts →
	Exact match “Hollingsworth LLP is among the nation’s leading litigation firms.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15	Powers LAW	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	101 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16	Rothwell Figg	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	94 contacts →
	Exact match “Rothwell Figg is a forward-thinking, client-focused law firm practicing at the convergence of intellectual property, litigation, and technology.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
17	CFS Compliance	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	11-50	90 contacts →
	Exact match “CFS Compliance is your one stop shop for all your compliance needs.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18	Hyman, Phelps & Mcnamara, P.C	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	82 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	Holtzman Vogel	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	80 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
20	Reno & Cavanaugh, Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	73 contacts →
	Exact match “Since 1977, Reno & Cavanaugh has been a national law firm dedicated to strengthening communities through strategic use of public and private resources.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	DOW Lohnes	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	201-500	73 contacts →
	Exact match “On January 1, 2014, Dow Lohnes merged with Cooley LLP.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22	Pilieromazza Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	70 contacts →
	Exact match “PilieroMazza – a business law firm – serves as a strategic partner to government contractors and commercial businesses from across the United States in numerous industries.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23	HWG LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	70 contacts →
	Exact match “HWG LLP is a boutique law firm designed to offer clients access to top tier legal talent without unnecessary overhead.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
24	Capitol Counsel, LLC	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	11-50	63 contacts →
	Exact match “Capitol Counsel, LLC is a full service government relations firm providing political analysis, strategic advice and advocacy services.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
25	MBA Consulting Group	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	53 contacts →
	Exact match “We provide superior compliance services to the political and non-profit communities by combining modern business principles, technology, and top-notch customer service with…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “regulatory law firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 302 regulatory law firms based in Washington, United States

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

As of Sep 29, 2026

59.9%Verified-email coverage

72.3Average contacts per company

1-10Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

188

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 302 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with Washington, United States whose business descriptions match “regulatory law firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 13,073 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Regulatory law firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “regulatory law firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many regulatory law firms are there based in Washington, United States?

RevenueBase identified 302 company matches for regulatory law firms associated with Washington, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Arnold & Porter tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most regulatory law firms?

New York leads the United States with 432 company records, followed by Washington (302) and Chicago (230).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 13,073 professional contacts with verified work emails tracked across these 302 companies; direct dials are available where recorded.

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 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.