Company lists · Data refreshed September 2026
Top 25 Union labor law firms based in Philadelphia, United States
RevenueBase identified 66 union labor law firms headquartered in Philadelphia, United States as of September 2026 and tracks 4,203 professional contacts across them, including 1,495 with verified work emails. Across the United States, New York is the largest hub for this category (320 companies); Philadelphia has 66.
This list covers union labor law firms headquartered in Philadelphia, 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.
The 25 largest union labor law firms based in Philadelphia, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 277 contacts → | ||||
Indirect evidence “Margolis Edelstein was founded in Philadelphia over 65 years ago.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 242 contacts → | ||||
Indirect evidence “With over 100 attorneys in offices throughout Pennsylvania, New Jersey, New York, Connecticut and Delaware, we provide businesses, organizations, and individuals with legal…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 215 contacts → | ||||
Partial evidence “A Philadelphia-based law firm handling wrongful injury lawsuits, including medical malpractice, product liability, premises liability, civil rights and auto accident litigation.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 204 contacts → | ||||
Partial evidence “Rawle & Henderson, LLP, is a Mid-Atlantic regional law firm whose attorneys engage in civil trial litigation.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 169 contacts → | ||||
Indirect evidence “At Pond Lehocky, we understand that behind every case is an individual relying on us for support.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 162 contacts → | ||||
Partial evidence “Berger Montague is one of the nation’s preeminent law firms focusing on complex civil litigation, class actions, and mass torts.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 153 contacts → | ||||
Indirect evidence “At Cohen Seglias, strong foundations are built on integrity, decency, and hard work-qualities we bring to every deal we close, every dispute we resolve, every case we try, and…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 139 contacts → | ||||
Partial evidence “Saltz Mongeluzzi Bendesky has earned a national reputation as one of the country's most specialized and experienced law firms in the representation of victims of construction…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 133 contacts → | ||||
Indirect evidence “Zarwin Baum DeVito Kaplan Schaer, P.C.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 80 contacts → | ||||
Strong evidence “Willig, Williams & Davidson is one of the largest and most respected union-side labor law firms in the United States.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 65 contacts → | ||||
Indirect evidence “For over 25 years, Lavin, Cedrone, Graver, Boyd & DiSipio has vigorously defended litigation throughout the United States.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 50 contacts → | ||||
Indirect evidence “The attorneys at Wilbraham, Lawler & Buba, P.C.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 50 contacts → | ||||
Partial evidence “McEldrew Purtell is a boutique law firm based in Philadelphia specializing in catastrophic injury / wrongful death and civil rights cases nationwide.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 49 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 41 contacts → | ||||
Partial evidence “Miller Shah LLP is a results-driven law firm that is focused on delivering the highest level of service possible to our worldwide clients.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 40 contacts → | ||||
Partial evidence “The Rothenberg Law Firm LLP, founded by Allen L.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 30 contacts → | ||||
Indirect evidence “In 2014, all of the lawyers at Hollstein Keating Cattell Johnson & Goldstein, P.C.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 28 contacts → | ||||
Strong evidence “Law practice representing labor since 1937.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 25 contacts → | ||||
Indirect evidence “At Stern & Cohen, we are committed to representing workers who have been injured on the job.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 21 contacts → | ||||
Partial evidence “Console Mattiacci Law, LLC is an employment rights law firm with offices in Philadelphia, Pennsylvania, Moorestown, New Jersey, New York, New York and Wayne, PA.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 13 contacts → | ||||
Indirect evidence “Williams Cedar is a firm of eight caring and compassionate trial lawyers who along with their staff represent only victims.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 10 contacts → | ||||
Indirect evidence “Specializing in mass tort, whistleblower, product liability, defective drugs, motor vehicle, class action, and medical malpractice litigation.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 8 contacts → | ||||
Indirect evidence “Since its founding, the firm Kohn, Swift & Graf, P.C.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 8 contacts → | ||||
Indirect evidence “Levin Sedran & Berman represents plaintiffs in complex cases on both a national and local level.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 8 contacts → | ||||
Indirect evidence “No one understands complex litigation better than Sacks Weston, LLC.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
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: union labor 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 union labor law firms.
- Partial evidence
- Its own public description names part of union labor law firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name union labor 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 66 union labor law firms based in Philadelphia, United States
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Union labor law firms based in Philadelphia, United States at a glance
As of Sep 29, 2026Companies by employee count
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 66 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 union labor 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 Philadelphia, United States whose own description of what they do matches “union labor 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 union labor 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 union labor law firms, and records with no verified work email. Companies headquartered outside Philadelphia 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, 1,495 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.
Union labor law firms by metro in the United States
- Union labor law firms in New York320
- Union labor law firms in Los Angeles264
- Union labor law firms in Chicago174
- Union labor law firms in Houston154
- Union labor law firms in San Diego118
- Union labor law firms in Atlanta101
- Union labor law firms in San Francisco100
- Union labor law firms in Dallas92
- Union labor law firms in Washington77
- Union labor law firms in Irvine64
- Union labor law firms in Miami64
- Union labor law firms in Boston59
- Union labor law firms in New Orleans57
- Union labor law firms in Minneapolis53
- Union labor law firms in St. Louis51
- Union labor law firms in Birmingham48
- Union labor law firms in Seattle48
- Union labor law firms in Phoenix47
- Union labor law firms in Denver46
- Union labor law firms in Tampa46
- Union labor law firms in Austin44
- Union labor law firms in Beverly Hills42
- Union labor law firms in Kansas City42
- Union labor law firms in Pasadena42
- Union labor law firms in Oakland36
- Union labor law firms in Cleveland34
- Union labor law firms in Las Vegas34
- Union labor law firms in Pittsburgh34
- Union labor law firms in Sacramento33
- Union labor law firms in Columbia31
- Union labor law firms in Columbus30
- Union labor law firms in Long Beach29
- Union labor law firms in Charlotte28
- Union labor law firms in Fort Lauderdale28
- Union labor law firms in San Antonio28
- Union labor law firms in Coral Gables27
- Union labor law firms in Raleigh26
- Union labor law firms in Portland25
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 union labor 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 union labor law firms are there based in Philadelphia, United States?
RevenueBase identified 66 union labor law firms headquartered in Philadelphia, 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?
Margolis Edelstein, headquartered in Philadelphia, tops this list with the largest team on record.
Which city in the United States has the most union labor law firms?
New York leads the United States with 320 headquartered companies, followed by Los Angeles (264) and Chicago (174). Philadelphia has 66.
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 1,495 verified decision-maker contacts tracked across these 66 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.
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