| Business | Phone |
| Atu Local 966 516 High St S, Thunder Bay P7B 3M3 | (807) 345-8813 |
| Health & Insurance Plan Admin 910 Cobalt Cres, Thunder Bay P7B 5W3 | (807) 623-7335 |
| International Assn Of Machnsts 1200 Walsh St W, Thunder Bay P7E 4X4 | (807) 475-4779 |
| International Brotherhood/Elec 910 Cobalt Cres, Thunder Bay P7B 5W3 | (807) 622-1498 |
| International Brotherhood-Elec 440 Balmoral St, Thunder Bay P7C 5G8 | (807) 625-4339 |
| International Brotherhood 402 910 Cobalt Cres, Thunder Bay P7B 5W3 | (807) 623-5759 |
| International Brotherhood 871 Tungsten St #C, Thunder Bay P7B 6H2 | (807) 623-8186 |
| International Union Operating 250 Park Ave, Thunder Bay P7B 1C2 | (807) 343-9493 |
| International Union-Engineers 107 Johnson Ave, Thunder Bay P7B 2V9 | (807) 344-7612 |
| International Union Bricklayer 54 Front St, Thunder Bay P7A 4K2 | (807) 345-5078 |
| Intl Brotherhood-Painters 191 Wolseley St, Thunder Bay P7A 3G5 | (807) 345-2681 |
| Iron Workers-Intl Assn 191 Wolseley St, Thunder Bay P7A 3G5 | (807) 345-8151 |
| Iwa Canada 929 Fort William Rd #6, Thunder Bay P7B 3A6 | (807) 345-9041 |
| Millwrights & Mach Erectors 936 Tungsten St, Thunder Bay P7B 5Z6 | (807) 623-3937 |
| Office & Professional Emplys 929 Fort William Rd #9, Thunder Bay P7B 3A6 | (807) 345-9344 |
| Ontario Public Svc Employees 1201 Amber Dr, Thunder Bay P7B 6M4 | (807) 344-5804 |
| Ontario Public Svc Emplys 732 1901 Sibley Dr #B203, Thunder Bay P7B 5E3 | (807) 622-0882 |
| Pace International Union 227 Otto St, Thunder Bay P7A 2T4 | (807) 344-0844 |
| Plumbers & Fitters Local 628 959 Alloy Dr, Thunder Bay P7B 5Z8 | (807) 623-1041 |
| Public Service Alliance Of Cnd 1205 Amber Dr #109, Thunder Bay P7B 6M4 | (807) 345-8442 |
| Service Employees Union 1200 Walsh St W, Thunder Bay P7E 4X4 | (807) 475-4217 |
| Sheet Metal Workers 905 Tungsten St, Thunder Bay P7B 5Z3 | (807) 622-2609 |
| Teamsters' International Union 274 Algoma St S, Thunder Bay P7B 3C2 | (807) 344-5082 |
| Thunder Bay & District Council 929 Fort William Rd #1, Thunder Bay P7B 3A6 | (807) 345-2621 |
| Transportation Communications 929 Fort William Rd #11, Thunder Bay P7B 3A6 | (807) 344-8131 |
| United Food & Comm Workers 929 Fort William Rd #21, Thunder Bay P7B 3A6 | (807) 346-4227 |
| United Steelworkers-America 929 Fort William Rd #11, Thunder Bay P7B 3A6 | (807) 345-0371 |
| Workers' Health & Safety Ctr 2114 Bordeaux Cres, Thunder Bay P7K 1C2 | (807) 473-3634 |
| Canadian Auto Workers 112 Gore St W, Thunder Bay P7E 3V9 | (807) 475-3308 |
| Canadian Labour Congress 929 Fort William Rd #18, Thunder Bay P7B 3A6 | (807) 345-6525 |
| Canadian Injured Workers Alnc 1201 Jasper Dr, Thunder Bay P7B 6R2 | (807) 345-3429 |
| Canadian Union Public Emplys 929 Fort William Rd #A, Thunder Bay P7B 3A6 | (807) 345-9511 |
| Canadian Union Public Emplys 79 Court St N #108, Thunder Bay P7A 4T7 | (807) 345-1731 |
| Carpenters' & Joiners Lcl 1669 929 Fort William Rd #7, Thunder Bay P7B 3A6 | (807) 344-0611 |
| Cep Ctr 516 High St S, Thunder Bay P7B 3M3 | (807) 346-1737 |
| Cep 406 Cumberland St N, Thunder Bay P7A 4P8 | (807) 345-5442 |
| Communication Energy & Pprwkrs 516 High St S, Thunder Bay P7B 3M3 | (807) 346-1735 |
| Communications Energy & Paper 516 High St S, Thunder Bay P7B 3M3 | (807) 346-1742 |
| Construction & Allied Workers 730 Balmoral St, Thunder Bay P7C 5V3 | (807) 622-0607 |
| Cupw 212 Miles St E #102, Thunder Bay P7C 1J6 | (807) 624-9131 |