Company lists · Data refreshed September 2026
Top 25 Trade unions worldwide
RevenueBase identified 1,094 trade unions worldwide as of September 2026 and tracks 43,390 professional contacts across them, including 8,804 with verified work emails. The United States is the largest market and Washington the largest hub.
This list covers trade unions worldwide, 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 22, 2026. Country and city lists for trade unions follow the table.
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 trade unions worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 9,357 contacts → | ||||
Indirect evidence “The IBEW represents 901,831 active.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,518 contacts → | ||||
Indirect evidence “HK er en af Danmarks største fagforeninger med næsten medlemmer, der arbejder inden for bl.a.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 22, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,203 contacts → | ||||
Indirect evidence “Het ACV is met 1,4 miljoen leden de grootste vakbond van België.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,156 contacts → | ||||
Indirect evidence “3F er Danmarks største fagforening med over medlemmer.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,147 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,052 contacts → | ||||
Partial evidence “The Teamsters are one of North America’s largest, most diverse unions.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,029 contacts → | ||||
Partial evidence “Unite is Britain's biggest union with 1.5 million members in every type of workplace Unite is the union for the 21st century.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 9 | 983 contacts → | ||||
Partial evidence “AFSCME is the nation’s largest and fastest growing public services employees union.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 10 | 829 contacts → | ||||
Indirect evidence “The mission of 1199SEIU is to advocate for quality healthcare, good jobs and social justice for all.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 11 | 778 contacts → | ||||
Indirect evidence “De naam Vakmensen zegt het al.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 12 | 685 contacts → | ||||
Strong evidence “GMB is a trade union that represents all workers.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 13 | 652 contacts → | ||||
Partial evidence “The 1.3 million members of the United Food and Commercial Workers International Union in the U.S.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 22, 2026Thanks. The Data Team will review it. | |||||
| 15 | 595 contacts → | ||||
Indirect evidence “CWA represents workers in both private and public sectors.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 16 | 581 contacts → | ||||
Indirect evidence “Gute Arbeitsbedingungen, faire Entlohnung, berufliche Perspektiven, sichere Arbeitsplätze, Mitbestimmung und Demokratie: Das sind die Ziele, die die IG Metall verfolgt.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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 22, 2026Thanks. The Data Team will review it. | |||||
| 18 | 486 contacts → | ||||
Strong evidence “With around members, Unia is the largest trade union in Switzerland.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 19 | 420 contacts → | ||||
Indirect evidence “The AFL-CIO represents people who work.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 20 | 392 contacts → | ||||
Indirect evidence “ver.di?” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 21 | 375 contacts → | ||||
Partial evidence “SMART, the International Association of Sheet Metal, Air, Rail and Transportation Workers, is one of North America’s most dynamic and diverse unions with members.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 22 | 342 contacts → | ||||
Indirect evidence “Fagforbundet er landets største arbeidstakerorganisasjon med 400 medlemmer og er en del av LO.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 23 | 322 contacts → | ||||
Indirect evidence “Fagforeningen Delta har medlemmer i alle deler av arbeidslivet, både i offentlig tjenesteyting og i private virksomheter.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 24 | 297 contacts → | ||||
Partial evidence “CLAC is an independent Canadian labour union that applies social principles of justice, respect, and dignity to the workplace community.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 25 | 294 contacts → | ||||
Indirect evidence “Wir sind eine starke Gemeinschaft und zählen mit mehr als Mitgliedern zu den größten Gewerkschaften in Deutschland.” Source: RevenueBase Database · checked Sep 22, 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: trade unions. 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 trade unions.
- Partial evidence
- Its own public description names part of trade unions, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name trade unions. 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 1,094 trade unions worldwide
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Trade unions worldwide at a glance
As of Sep 22, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 trade unions, 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.
- Coverage
- Every country. Country and city lists for trade unions are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “trade unions”. 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 trade unions), 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 trade unions, and records with no verified work email.
- 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, 8,804 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 22, 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.
Trade unions by location
3 lists · largest firstEvery Trade unions list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 trade unions, 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 trade unions are there worldwide?
RevenueBase identified 1,094 trade unions worldwide 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 country has the most trade unions?
The United States leads with 398 companies, followed by Brazil (136) and Canada (65). Every trade unions list by country and city is linked on this page.
Which city has the most trade unions?
Washington leads with 30 headquartered companies, followed by New York (26) and Paris (14).
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 8,804 verified decision-maker contacts tracked across these 1,094 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 22, 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.