| Business | Phone |
| Warren City Employees 30500 Van Dyke Ave, Warren 48093 | (586) 574-1360 |
| Warren Education Assn 12434 E 12 Mile Rd 203, Warren 48093 | (586) 573-7750 |
| Warren Police Officers Assn 11304 E 14 Mile Rd, Warren 48093 | (586) 978-3990 |
| Afscme 23200 Ryan Rd, Warren 48091 | (586) 757-0746 |
| Uaw 24257 Mound Rd, Warren 48091 | (586) 755-3300 |
| United Automobile Workers-Amer 28504 Lorna Ave, Warren 48092 | (586) 751-4474 |
| United Automobile Workers-Amer 7420 Murthum Ave, Warren 48092 | (586) 264-5780 |
| Uaw Legal Svc Plan 30500 Van Dyke Ave 700, Warren 48093 | (586) 573-1800 |
| Uaw Local # 140 23345 Pinewood St, Warren 48091 | (586) 756-9300 |
| Uaw-International Union 2005 Tobsal Ct, Warren 48091 | (586) 754-2450 |
| Uaw-Intl Union Local 909 5587 Stephens Rd, Warren 48091 | (586) 759-4320 |
| United Auto Workers Of America 2019 Tobsal Ct, Warren 48091 | (586) 757-4430 |
| United Automobile Workers 24249 Mound Rd, Warren 48091 | (586) 756-4193 |
| American Federation Government 28251 Van Dyke Ave, Warren 48093 | (586) 574-1940 |
| American Federation-State Empl 28000 Van Dyke Ave 102, Warren 48093 | (586) 582-8000 |
| Tile Marble & Terrazzo & Craft 21031 Ryan Rd, Warren 48091 | (586) 757-5325 |
| Bricklayers & Masons Union 21031 Ryan Rd, Warren 48091 | (586) 754-0888 |
| Sheet Metal Workers Local 80 32700 Dequindre Rd, Warren 48092 | (586) 979-5190 |
| Roofers Apprentice School 21200 Schoenherr Rd, Warren 48089 | (248) 543-3847 |
| Council 30 United Distributive 26091 Sherwood Ave 4b, Warren 48091 | (586) 757-4055 |
| Intl Assn-Machinists Aerospace 31845 Ryan Rd F, Warren 48092 | (586) 939-6490 |