| Business | Phone |
| Service Employees Union 18 Fifth St N, Chatham N7L 2Z5 | (519) 352-0711 |
| Uaw Subregional Office 220 Wellington St W, Chatham N7M 1J6 | (519) 360-9888 |
| United Steel Workers-America 125 Irwin, Chatham N7M 5L3 | (519) 354-0625 |
| Canadian Union Of Postal 143 Wellington St W, Chatham N7M 1J5 | (519) 436-1018 |
| Caw Local 35 23 Leeson Dr, Chatham N7M 5T9 | (519) 354-4690 |
| Caw-Canada Area Office 200 Riverview Dr, Chatham N7M 5Z8 | (519) 354-5800 |
| Caw 280 Merritt Ave, Chatham N7M 3G1 | (519) 354-3450 |
| Chatham District Labour Cncl 334 King St W, Chatham N7M 1G1 | (519) 351-6621 |
| Christian Labour Assn-Canada 455 Keil Dr S, Chatham N7M 6M4 | (519) 354-4831 |
| Cnfiu Wheels Employees 615 Richmond St, Chatham N7M 1R2 | (519) 352-6716 |
| Cupe Local 12 336 King St W, Chatham N7M 1G1 | (519) 355-0611 |