| Business | Phone |
| American Federation Government Po Box 960001, Stockton 95296 | (209) 982-0246 |
| American Postal Workers Union 3131 Arch Airport Rd, Stockton 95213 | (209) 983-9750 |
| California School Employees 5375 West Ln, Stockton 95210 | (209) 472-6100 |
| Cannery Workers Union Six 745 E Miner Ave, Stockton 95202 | (209) 948-2800 |
| Cement Masons Union 2350 E Main St, Stockton 95205 | (209) 466-0602 |
| Central Labor Council 1045 N El Dorado St, Stockton 95202 | (209) 948-5526 |
| Communications Workers-America 404 W Harding Way, Stockton 95204 | (209) 466-2646 |
| Health Care Workers Union 242 N Sutter St, Stockton 95202 | (209) 933-9962 |
| Health Care Workers Union Seiu 306 E Main St, Stockton 95202 | (209) 944-8001 |
| Ibew 1531 El Pinal Dr, Stockton 95205 | (209) 466-4966 |
| Ilwu Local 22 N Union St, Stockton 95205 | (209) 464-1827 |
| Ilwu Local 2201 W Washington St, Stockton 95203 | (209) 948-0098 |
| Laborers International Union 2841 E Myrtle St, Stockton 95205 | (209) 466-3356 |
| Local 988 Afge 5014 Kimball Hill Cir, Stockton 95210 | (209) 472-8676 |
| National Assn-Letter Carriers 4801 E Fremont St, Stockton 95215 | (209) 466-6081 |
| Operating Engineers Local 1916 N Broadway Ave, Stockton 95205 | (209) 943-2332 |
| Opertng Engrs Joint Apprentice 1916 N Broadway Ave, Stockton 95205 | (209) 944-5603 |
| Plumbers & Pipefitters 3935 Coronado Ave, Stockton 95204 | (209) 464-4559 |
| Seiu 37 N Hunter Square Plz, Stockton 95202 | (209) 463-3283 |
| Sheet Metal Workers 2707 E Fremont St, Stockton 95205 | (209) 939-9375 |
| Ship Clerks Assn Ilwu 1024 W Robinhood Dr # 8, Stockton 95207 | (209) 478-8864 |
| Stockton Musicians Assn-Afm 33 W Alpine Ave, Stockton 95204 | (209) 464-4016 |
| Teamsters General 1531 E Fremont St # 5, Stockton 95205 | (209) 948-9592 |