Biggest Labor Unions in the US

Can you name the 25 biggest labor unions in the United States?

Not including national trade union centers like the AFL-CIO

Source here: https://en.wikipedia.org/wiki/List_of_labor_unions_in_the_United_States

Both acronyms or full names will be accepted

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Last updated: January 19, 2026

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Members	Answer
2,839,808	National Education Association
1,901,961	Service Employees International Union
1,700,000	American Federation of Teachers
1,459,511	American Federation of State, County and Municipal Employees
1,400,000	Teamsters
1,300,000	United Food and Commercial Workers
990,000	United Auto Workers
860,264	United Steelworkers
820,000	International Brotherhood of Electrical Workers
669,772	Laborers' International Union of North America
653,781	International Association of Machinists and Aerospace Workers
545,638	Communications Workers of America
522,416	United Brotherhood of Carpenters and Joiners of America

Members	Answer
424,579	International Longshore and Warehouse Union
392,584	International Union of Operating Engineers
331,003	International Association of Fire Fighters
324,043	United Association
301,886	UNITE HERE
292,221	National Association of Letter Carriers
289,023	American Federation of Government Employees
286,700	American Postal Workers Union
269,204	National Postal Mail Handlers Union
190,000	Amalgamated Transit Union
168,000	International Alliance of Theatrical Stage Employees
152,294	American Nurses Association