Company lists · Data refreshed September 2026

Top 25 Tax law firms based in Washington, United States

Name: Tax 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 6, 2026 86 companies tracked

RevenueBase identified 86 company matches for tax law firms associated with Washington, United States as of September 2026 and tracks 7,609 professional contacts across them, including 4,829 with verified work emails. Across the United States, New York is the largest hub for this category (496 companies); Washington has 86.

This list covers company matches for tax 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 6, 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 6, 2026 How this list was built

86Companies

7,609Contacts tracked

4,829Verified emails

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

Ranked by team size

Top 25 of 86 company matches for tax law firms based in Washington, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 6, 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 6, 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 6, 2026 · View company records in RevenueBase
2	Bakerhostetler	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 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 6, 2026 · View company records in RevenueBase
3	Venable LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 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 6, 2026 · View company records in RevenueBase
4	Wiley Rein LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 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 6, 2026 · View company records in RevenueBase
5	Think LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	51-200	54 contacts →
	Exact match “Think, LLP is a national professional tax services firm that consists of former Big-4 partners from the national tax practices, attorneys, CPAs, engineers, former IRS technicians…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
6	Ivins, Phillips & Barker	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	50 contacts →
	Exact match “Ivins, Phillips & Barker is exclusively engaged in the practice of federal tax, benefits and compensation, and estate and gift tax law.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
7	Kozusko Harris Duncan	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	34 contacts →
	Exact match “Kozusko Harris Vetter Wareh Duncan LLP ("KHD") is a boutique trusts and estates law firm serving a select group of clients.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
8	Webster, Chamberlain & Bean LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	27 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
9	GKG Law, P.C	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	26 contacts →
	Exact match “Beginning in 1955, GKG Law remains dedicated to crafting the best approach to meet our clients’ needs.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
10	Ruggeri Parks Weinberg LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	20 contacts →
	Exact match “Built on decades of experience and a deep commitment to our long-standing clients, our attorneys guide clients through all aspects of their largest, most sensitive and critical…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
11	Kalbian Hagerty LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	17 contacts →
	Exact match “Kalbian Hagerty LLP is an international general practice law firm with offices in Washington, D.C, Abu Dhabi, U.A.E, and New York City and a strategic alliance with a prominent…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
12	Rosemckenna, Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	17 contacts →
	Exact match “RoseMcKenna PLLC is a boutique accounting firm dedicated to providing the absolute best in personalized and professional tax services.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
13	CWP Consulting INC	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	16 contacts →
	Exact match “CWP Consulting was built around the desire to provide quality, professional services to individuals and business owners through the use of specialized and individualized services.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
14	Veritas LAW	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	1-10	16 contacts →
	Exact match “A full-service business law firm, Veritas Law has expertise in corporate and transactional law, litigation, and licensing.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
15	Friedlander Misler Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	14 contacts →
	Exact match “Founded in 1964, we are a Washington, D.C.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
16	Watkinson Miller Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	12 contacts →
	Exact match “WATKINSON MILLER PLLC is a law practice company based out of 1100 New Jersey Ave SE Suite 910, WASHINGTON, District of Columbia, United States.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
17	Basswood Counsel	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	12 contacts →
	Exact match “At Basswood Counsel, we believe that we should be as dynamic and growth-oriented as the companies we serve.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
18	Rosefelt TAX LAW	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	10 contacts →
	Exact match “Rosefelt Tax Law is a Washington, DC Metro-based firm with a national practice representing clients with serious tax problems and financial concerns.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
19	Royal LAW Firm, Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	1-10	10 contacts →
	Exact match “The Royal Law Firm PLLC, founded in 2009 by Priya Prakash Royal, Esq, LL.M, MBA, AEP®, TEP, is a private client law firm serving individuals, families, and closely held…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
20	Helfer And Company, LLC	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	1-10	7 contacts →
	Exact match “For over three decades, Alan S.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
21	Capitol TAX Partners	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	6 contacts →
	Exact match “In 2001 Capitol Tax Partners’ founders relied on decades of government experience to create Washington’s premier tax firm that could provide clients with both political and tax…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
22	Pontius TAX Law, Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	1-10	5 contacts →
	Exact match “Pontius Tax Law, PLLC represents individual and business clients with sensitive and serious tax matters before the Internal Revenue Service and state taxing authorities.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
23	Morgan Wingate & Co, P.C	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	11-50	5 contacts →
	Exact match “Welcome to the firm of” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
24	Musolino & Dessel, Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	1-10	5 contacts →
	Exact match “Musolino & Dessel PLLC is a boutique law firm based out of 1615 L St NW #440, Washington, D.C.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
25	Tobin, O'connor & Ewingdc	Exact match	Washington, DC, United StatesHQ recorded Sep 6, 2026	1-10	5 contacts →
	Exact match “Washington DC Business Lawyer Large-Firm Results with Boutique-Firm Attention At Tobin, O’Connor & Ewing, we focus on providing our clients with effective representation and…” Recorded in the RevenueBase company graph · Sep 6, 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 “tax 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 86 tax law firms based in Washington, United States

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

As of Sep 6, 2026

63.5%Verified-email coverage

88.5Average contacts per company

1-10Median size (employees)

Sep 6, 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 86 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 “tax 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 4,829 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 6, 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.

Tax 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 “tax law firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 86 company matches for tax 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 tax law firms?

New York leads the United States with 496 company records, followed by Houston (274) and Chicago (259). Washington has 86.

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 4,829 professional contacts with verified work emails tracked across these 86 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 6, 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.