| Business | Phone |
| Amalgamated Transit Union 1333 Pine St, Martinez 94553 | (925) 229-1142 |
| Building & Construction Trades 935 Alhambra Ave, Martinez 94553 | (925) 228-0900 |
| Ibew 1875 Arnold Dr, Martinez 94553 | (925) 228-2302 |
| Public Employees' Union Local 5034 Blum Rd, Martinez 94553 | (925) 228-1600 |
| Teamsters Union Local 2727 Alhambra Ave, Martinez 94553 | (925) 228-2246 |
| United Food & Commercial Wrkrs 4121 Alhambra Ave, Martinez 94553 | (925) 228-8800 |
| Afscme 1000 Court St, Martinez 94553 | (925) 228-4400 |
| Afscme Hotline Martinez 94553 | (925) 229-0229 |
| Carpenters Union 152 3780 Alhambra Ave, Martinez 94553 | (925) 228-1858 |
| Laborers International Union 611 Berrellesa St, Martinez 94553 | (925) 228-0930 |
| Painters & Allied Trade Union 935 Alhambra Ave, Martinez 94553 | (925) 228-7020 |
| Paper Allied Ind Chemical 1333 Pine St, Martinez 94553 | (925) 228-3100 |
| Plumbers & Steamfitters 1308 Roman Way, Martinez 94553 | (925) 229-0400 |
| Plumbers Joint Apprenticeship 1308 Roman Way, Martinez 94553 | (925) 229-0883 |
| Public Employees Union 5034 Blum Rd, Martinez 94553 | (925) 228-1600 |
| United Professional Fire Fghtr 112 Blue Ridge Dr, Martinez 94553 | (925) 932-1230 |