| Business | Phone |
| National Postal Mail Handlers 250 E Boulevard Dr, Flint 48502 | (810) 233-3015 |
| Afl-Cio 1214 S Saginaw St, Flint 48502 | (810) 232-5412 |
| Uaw 1222 Glenwood Ave, Flint 48503 | (810) 244-0321 |
| Sheet Metal Workers Local 7 4070 Dolan Dr, Flint 48504 | (810) 785-6831 |