Company lists · Data refreshed September 2026
Top 25 Unions and employment organizations based in the United States
RevenueBase identified 240 unions and employment organizations headquartered in the United States as of September 2026 and tracks 19,453 professional contacts across them, including 2,432 with verified work emails. Washington is the largest hub.
This list covers unions and employment organizations headquartered in the 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 19, 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 unions and employment organizations based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 9,357 contacts → | ||||
Indirect evidence “The IBEW represents 901,831 active.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,406 contacts → | ||||
Partial evidence “We are the Service Employees International Union, an organization of 2-million members united by the belief in the dignity and worth of workers and the services they provide and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,147 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,052 contacts → | ||||
Partial evidence “The Teamsters are one of North America’s largest, most diverse unions.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 983 contacts → | ||||
Partial evidence “AFSCME is the nation’s largest and fastest growing public services employees union.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 610 contacts → | ||||
Partial evidence “32BJ SEIU is the largest property service workers union in the country, representing more than office cleaners, security officers, doormen, porters, maintenance workers, bus…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 577 contacts → | ||||
Partial evidence “The AFT is a union of professionals that champions fairness; democracy; economic opportunity; and high-quality public education, healthcare and public services for our students…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 420 contacts → | ||||
Indirect evidence “The AFL-CIO represents people who work.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 198 contacts → | ||||
Partial evidence “SEIU Local 721 is a dynamic, fast-growing organization recognized as one of the largest and strongest unions of publicly-funded employees in the nation.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 168 contacts → | ||||
Indirect evidence “The MTA is the voice of teachers, faculty, professional staff and education support professionals working at public schools, colleges and universities across Massachusetts.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 101 contacts → | ||||
Indirect evidence “SEIU Local 521 is on the cutting edge of progressive activism, building the power of workers and engaging in larger social justice issues such as immigration, racial and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 100 contacts → | ||||
Indirect evidence “We are an organization of more than people who, by joining together, are achieving what we cannot accomplish alone.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 81 contacts → | ||||
Indirect evidence “SEIU Local 1 members are working in 11 cities in six states, and our jobs are some of the highest paying in our industries.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 80 contacts → | ||||
Partial 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 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 77 contacts → | ||||
Indirect evidence “Members of UNITE HERE Local 11 join together to fight for improved living standards and working conditions.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 52 contacts → | ||||
Indirect evidence “UFCW 8-Golden State is dedicated to maintaining, improving and enforcing collective bargaining agreements.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 45 contacts → | ||||
Partial evidence “The United Service Workers Union, IUJAT (USWU) can trace its origins back to a small independent labor organization, representing approximately members that was created in the…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 44 contacts → | ||||
Partial evidence “Oregon AFSCME Council 75 represents over workers statewide in both public and private sector and is one of the fastest growing unions in Oregon.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 41 contacts → | ||||
Partial evidence “We are a union representing over supermarket workers throughout Long Island, the five boroughs and Dutchess & Westchester Counties.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 39 contacts → | ||||
Indirect evidence “At Cohen, Weiss and Simon LLP, we are proud of our reputation as one of the nation's leading firms devoted exclusively to the interests of labor and working people.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 39 contacts → | ||||
Indirect evidence “With more than members nationwide across air, rail, gaming and transit divisions, TWU moves America.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 35 contacts → | ||||
Partial evidence “O'Donoghue & O'Donoghue LLP is one of the largest and oldest union-side law firms in the United States, with offices in Washington, D.C, Philadelphia, Pennsylvania, and Annapolis…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 34 contacts → | ||||
Indirect evidence “A group of employees founded University Professional and Technical Employees (UPTE) in 1990, believing that workers across the University of California and at Lawrence Berkeley…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 29 contacts → | ||||
Partial evidence “A Law Firm For The People Who Keep America Working Weinberg, Roger & Rosenfeld is one of the nation’s leading firms representing unions and working people in all aspects of labor…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 28 contacts → | ||||
Strong evidence “Union representing public safety personnel at various Municipal and County Offices in their contract negotiations, grievances and other employment issues.” Source: RevenueBase Database · checked Sep 19, 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: unions and employment organizations. 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 unions and employment organizations.
- Partial evidence
- Its own public description names part of unions and employment organizations, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name unions and employment organizations. 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 240 unions and employment organizations based in the United States
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Unions and employment organizations based in the United States at a glance
As of Sep 19, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 240 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 unions and employment organizations, 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 the United States whose own description of what they do matches “unions and employment organizations”. 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 unions and employment organizations), 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 unions and employment organizations, and records with no verified work email. Companies headquartered outside United States 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, 2,432 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 19, 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.
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 unions and employment organizations, 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 unions and employment organizations are there based in the United States?
RevenueBase identified 240 unions and employment organizations headquartered in the 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?
International Brotherhood Of Electrical Workers Ibew, headquartered in Washington, tops this list with the largest team on record.
Which city has the most unions and employment organizations?
Washington leads with 19 headquartered companies, followed by New York (14) and Los Angeles (7).
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 2,432 verified decision-maker contacts tracked across these 240 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 19, 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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