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National Labor Organizations with Membership over 100,000

Members Union1
2,731,419National Education Association of the United States2
1,505,100Service Employees International Union3
1,459,511American Federation of State, County, and Municipal Employees
1,396,174International Brotherhood of Teamsters3
1,311,548United Food and Commercial Workers International Union
828,512American Federation of Teachers
754,978United Steelworkers of America
704,794International Brotherhood of Electrical Workers
669,772Laborers' International Union of North America
653,781International Association of Machinists and Aerospace Workers
557,099International Union, United Automobile, Aerospace, and Agricultural Implement Workers of America
545,638Communications Workers of America
522,416United Brotherhood of Carpenters and Joiners of America2
455,346Union of Needletrades, Industrial, and Textile Employees
424,579Longshore and Warehouse Union
392,584International Union of Operating Engineers
361,362Maritime Trades
324,043United Association of Journeymen and Apprentices of the Plumbing and Pipe-Fitting Industry of the U.S. and Canada
292,221National Association of Letter Carriers
286,700American Postal Workers Union
271,463International Association of Fire Fighters
269,204National Postal Mail Handlers Union
245,011Paper, Allied-Industrial, and Chemical International Union
226,975American Federation of Government Employees
180,598Amalgamated Transit Union
152,294American Nurses Association2
148,806Sheet Metal Workers International Association
127,278International Brotherhood of Painters and Allied Trades
125,437International Association of Bridge, Structural, Ornamental, and Reinforcing Iron Workers
125,398Transport Workers Union of America
125,000Building and Construction Trades
111,851American Association of Classified School Employees2
105,460The National Rural Letter Carriers' Association2
1. Unless otherwise noted, unions are AFL-CIO affiliated.
2. Not AFL-CIO affiliated.
3. Severed ties with the AFL-CIO in July 2005.
Source: U.S. Department of Labor.

Information Please® Database, © 2007 Pearson Education, Inc. All rights reserved.

Work Stoppages (Strikes) Involving 1,000 Workers or MoreLabor UnionsUnion Affiliation of Employed Wage and Salary Workers, 1983–2005

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