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- American Federation of Musicians, Local 308
- American Federation of Government Employees, Local 1260
- American Federation of State County and Municipal Employees, Local 2620
- American Federation of State County and Municipal Employees, Local 3299
- AFT Local 1273 - Oxnard Federation of Teachers and School Employees
- AFT Local 1828 - Ventura County Federation of College Teachers
- AFT Local 2071 - Santa Paula Federation of Teachers
- AFT Local 2119 - Ojai Federation of Teachers
- AFT Local 2141 - UC-AFT Santa Barbara
- AFT Local 2216 - Carpinteria Association of United School Employees
- AFT Local 3151 - Lompoc Federation of Teachers
- AFT Local 3553 - Paso Robles Public Educators
- AFT Local 4434 - Ventura County Federation of School Employees
- AFT Local 4434-1 - Ventura County Federation of Paraeducators
- AFT Local 4606 - Cuesta College Classified United Employees
- AFT Local 4909 - Cuesta College Federation of Teachers
- AFT Local 6185 - Part-Time Faculty Association of Allen Hancock College
- American Postal Workers Union, Local 264
- American Postal Workers Union, Local 589
- California Faculty Association, Channel Islands
- California Faculty Association, San Luis Obispo
- California Federation of Teachers
- Communications Workers of America, Local 9423
- Communications Workers of America, Local 9575
- Heat and Frost Insulators, Local 5
- IAFF Local 1364 - Ventura County Professional Firefighters
- International Association of Machinists and Aerospace Workers, Local 2786
- International Brotherhood of Electrical Workers, Local 47
- International Brotherhood of Electrical Workers, Local 413
- International Brotherhood of Electrical Workers, Local 639
- International Brotherhood of Electrical Workers, Local 952
- International Brotherhood of Electrical Workers, Local 1245
- International Brotherhood of Teamsters, Local 186
- International Brotherhood of Teamsters, Local 986
- International Brotherhood of Teamsters, Local 2010
- International Union of Operating Engineers, Local 12
- International Union of Operating Engineers, Local 501
- International Union of Painters & Allied Trades, District Council 36
- Ironworkers, Local 416
- Ironworkers, Local 433
- Jewish Labor Committee
- Laborers International Association of North America, Local 585
- Laborers International Association of North America, Local 220
- National Association of Letter Carriers, Local 52
- National Association of Letter Carriers, Local 2902
- Office & Professional Employees International Union, Local 277
- Office & Professional Employees International Union, Local 537
- Operative Plasterers & Cement Masons International Association, Local 600
- Service Employees International Union, Local 121RN
- Service Employees International Union, Local 721
- Service Employees International Union, Local 1000
- Service Employees International Union, Local 2015
- Service Employees International Union - United Healthcare Workers
- Sheetmetal Workers, Local 104
- United Association of Plumbers & Pipefitters, Local 484
- United Auto Workers - United Student Workers Union, Local 2865
- United Domestic Workers Associates - AFSCME, Local 3930
- United Farm Workers
- United Food and Commercial Workers International Union, Local 770
- United Steelworkers