| Business | Phone |
| Communications Workers-America 2441 W Water St, Port Huron 48060 | (810) 987-4107 |
| St Clair County Afl Cio 2441 W Water St, Port Huron 48060 | (810) 966-0387 |
| Ibew 2441 W Water St, Port Huron 48060 | (810) 982-1883 |
| Pipe Fitters 2441 W Water St, Port Huron 48060 | (810) 985-3620 |