Company lists · Data refreshed October 2026

Top 18 Constitutional law firms based in Philadelphia, United States

Name: Constitutional law firms based in Philadelphia, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 37 companies tracked

RevenueBase identified 37 company matches for constitutional law firms associated with Philadelphia, United States as of October 2026 and tracks 2,480 professional contacts across them, including 414 with verified work emails. Across the United States, New York is the largest hub for this category (142 companies); Philadelphia has 37.

This list covers company matches for constitutional law firms associated with Philadelphia, 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 October 1, 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 Oct 1, 2026 How this list was built

37Companies

2,480Contacts tracked

414Verified emails

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The 18 largest constitutional law firms based in Philadelphia, United States

Ranked by team size

Top 18 of 37 company matches for constitutional law firms based in Philadelphia, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 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	Margolis Edelstein	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	201-500	277 contacts →
	Exact match “Margolis Edelstein was founded in Philadelphia over 65 years ago.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	Hangley Aronchick Segal Pudlin & Schiller	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	51-200	102 contacts →
	Exact match “When our firm was founded in 1994, our idea was to build a firm of lawyers with superior academic credentials and professional capabilities who wanted to develop their practices…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Mceldrew Purtell	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	51-200	50 contacts →
	Exact match “McEldrew Purtell is a boutique law firm based in Philadelphia specializing in catastrophic injury / wrongful death and civil rights cases nationwide.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	Feldman Shepherd Wohlgelernter Tanner Weinstock Dodig LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	11-50	49 contacts →
	Exact match “Recognized as one of the preeminent civil litigation law firms in Pennsylvania and New Jersey, the attorneys of Feldman Shepherd have established a track record of winning…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	VAN DER Veen, Hartshorn, Levin & Lindheim	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	n/a	35 contacts →
	Exact match “Founded in 2014, van der Veen, Hartshorn and Levin provides personalized legal representation to clients throughout Philadelphia and the surrounding areas.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	Astor Weiss Kaplan & Mandel, LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	11-50	24 contacts →
	Exact match “ABOUT THE FIRM Astor Weiss Kaplan & Mandel, LLP offers a broad range of expert legal services to its clients by providing high-quality representation.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	The Beasley Firm, LLC	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	51-200	14 contacts →
	Exact match “It takes a very special range of skills to win highly complex suits involving multiple parties and theories.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	Kohn Swift & Graf, P.C	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	11-50	8 contacts →
	Exact match “Since its founding, the firm Kohn, Swift & Graf, P.C.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	Nastlaw LLC	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	11-50	7 contacts →
	Exact match “NastLaw is a national law firm based in Philadelphia that provides clients with experienced, confident representation in the most difficult cases.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	GAY Chacker & Ginsburg	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	11-50	5 contacts →
	Exact match “Gay Chacker & Ginsburg was founded in Philadelphia in 1965.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Giampolo LAW Group	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	1-10	5 contacts →
	Exact match “GLG champions for its clients’ legal needs and cultivates personal relationships with each throughout the process.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Abramson & Denenberg, P.C	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	51-200	5 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	Charlson Braber Mccabe & Denmark	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	1-10	4 contacts →
	Exact match “Charlson Braber McCabe & Denmark is the firm you've been looking for.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Bazelon Less & Feldman, P.C	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	11-50	3 contacts →
	Exact match “Founded in 1983, Bazelon Less & Feldman was born of a belief that most commercial litigation matters could best be handled by a small group of highly talented and experienced…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Horn Williamson, LLC	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	11-50	3 contacts →
	Exact match “HORN WILLIAMSON, LLC is a law firm located in Center City Philadelphia that serves clients throughout the Mid-Atlantic region.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	First LAW Strategy Group, LLC	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	1-10	3 contacts →
	Exact match “First Law Strategy Group is an unique law firm specializing in "Values Work." Whether you value justice, civil rights, property rights, public policy rights, or "simply" fair…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	Lyman & ASH	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	1-10	2 contacts →
	Exact match “Founded in 1972, Lyman & Ash has a history of protecting the rights of individuals, with trial and appellate experience at all levels, and has helped shape the law through…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	LAW Offices Of Hope Lefeber	Exact match	Philadelphia, PA, United StatesHQ recorded Oct 1, 2026	1-10	1 contacts →
	Exact match “Hope Lefeber leads a legal defense team tailored to each case she handles, including experienced investigators, top experts and professionals, such forensic experts and tax…” Recorded in the RevenueBase company graph · Oct 1, 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 “constitutional 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 18 of 37 constitutional law firms based in Philadelphia, United States

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Constitutional law firms based in Philadelphia, United States at a glance

As of Oct 1, 2026

16.7%Verified-email coverage

67.0Average contacts per company

11-50Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Philadelphia, so it is reported there. Company counts and contact totals on this page are exact for Philadelphia, over 37 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 Philadelphia, United States whose business descriptions match “constitutional 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 414 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 October 1, 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.

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

How many constitutional law firms are there based in Philadelphia, United States?

RevenueBase identified 37 company matches for constitutional law firms associated with Philadelphia, United States as of October 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?

Margolis Edelstein 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 constitutional law firms?

New York leads the United States with 142 company records, followed by Washington (75) and Chicago (66). Philadelphia has 37.

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 414 professional contacts with verified work emails tracked across these 37 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 October 1, 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.