| Business | Phone |
| Amalgamated Transit Union 26 Wilson St, Hamilton L8R 1C5 | (905) 528-6418 |
| Hamilton & Dist Labour Council 1130 Barton St E #210, Hamilton L8H 7P9 | (905) 547-2944 |
| Hamilton Brantford Ontario 1104 Fennell Ave E, Hamilton L8T 1R9 | (905) 389-1574 |
| Hamilton Steelworkers Area 1031 Barton St E, Hamilton L8L 3E2 | (905) 312-6995 |
| Hamilton Wentworth Teachers 65 Nebo Rd, Hamilton L8W 2C9 | (905) 318-2771 |
| Iatse 56 Flatt Ave, Hamilton L8P 4N3 | (905) 572-9193 |
| International Brotherhood-Blr 1846 Burlington St E, Hamilton L8H 3L4 | (905) 547-9492 |
| International Brotherhood-Pntr 1104 Fennell Ave E, Hamilton L8T 1R9 | (905) 387-8293 |
| International Longshoreman's 1000 Ferguson Ave N, Hamilton | (905) 529-0955 |
| International Union-Painters 1104 Fennell Ave E #216, Hamilton L8T 1R9 | (905) 318-5855 |
| International Union-Engineers 370 Main St E #302, Hamilton L8N 1J6 | (905) 527-5250 |
| International Union-Engineers 397 Melvin Ave, Hamilton L8H 2K6 | (905) 544-1851 |
| International Union-Elevator 300 Fennell Ave E, Hamilton L9A 1T2 | (905) 383-9166 |
| Ironworkers Tip 1955 Upper James St, Hamilton L9B 1K8 | (905) 679-6962 |
| Iron Worker's Union 1955 Upper James St, Hamilton L9B 1K8 | (905) 679-6439 |
| Ontario Public Svc Employees 55 Frid St, Hamilton L8P 4M3 | (905) 527-7784 |
| Joint Apprentice & Training 195 Dartnall Rd, Hamilton L8W 3V9 | (905) 385-6095 |
| Canadian Union-Public Employee 1112 Rymal Rd E, Hamilton L8W 3N7 | (905) 388-2425 |
| Labourers International Union 44 Hughson St S, Hamilton L8N 2A7 | (905) 522-7177 |
| Labourer's Intl Union 837 44 Hughson St S #200, Hamilton L8N 2A7 | (905) 529-1116 |
| Ontario Federation-Healthcare 44 Hughson St S, Hamilton L8N 2A7 | (905) 525-4314 |
| Millwright 300 Fennell Ave E, Hamilton L9A 1T2 | (905) 385-2462 |
| Teamsters 460 Parkdale Ave N, Hamilton L8H 5Y2 | (905) 547-3231 |
| National Automobile Aerospace 51 Stuart St, Hamilton L8L 1B5 | (905) 522-3917 |
| Office & Pro Employees Intn 149 Sanford Ave N, Hamilton L8L 5Z4 | (905) 529-2777 |
| Ontario Nurses' Assn 393 Rymal Rd W #205, Hamilton L9B 1V2 | (905) 383-3341 |
| Ontario Public Svc Employees 31 Empress Ave, Hamilton L9A 1M1 | (905) 317-3977 |
| Ontario Secondary School Tchrs 1423 Upper Ottawa St, Hamilton L8W 3J6 | (905) 574-8285 |
| Ontario Public Svc Emplyees Un 55 Frid St, Hamilton L8P 4M3 | (905) 525-5527 |
| Service Employees Intl Union 460 Main St E, Hamilton L8N 1K4 | (905) 527-2584 |
| Sheet Metal Workers 479 Main St E, Hamilton L8N 1K1 | (905) 528-8737 |
| Tcu David Neale 1031 Barton St E, Hamilton L8L 3E3 | (905) 383-1520 |
| Ufcw 1575 Barton St E, Hamilton | (905) 544-5494 |
| United Assn Of Journeymen 195 Dartnall Rd, Hamilton L8W 3V9 | (905) 385-0043 |
| United Food & Commercial Wrkrs 412 Rennie St, Hamilton L8H 3P5 | (905) 545-8354 |
| United Steelworkers-Security 1031 Barton St E, Hamilton L8L 3E2 | (905) 312-8512 |
| United Steelworkers 1031 Barton St E, Hamilton L8L 3E2 | (905) 549-4412 |
| United Steelworkers Of America 1031 Barton St E, Hamilton L8L 3E3 | (905) 545-3008 |
| United Steelworkers Of America 350 Kenilworth Ave N, Hamilton L8H 4T3 | (905) 547-1417 |
| United Steele Workers Of Amer 1031 Barton St E, Hamilton L8L 3E2 | (905) 549-1650 |
| United Steelworkers 4752 1031 Barton St E, Hamilton L8L 3E3 | (905) 549-9688 |
| United Steelworkers 7135 1031 Barton St E, Hamilton L8L 3E3 | (905) 544-3554 |
| United Transportation Union 350 Kenilworth Ave N, Hamilton L8H 4T3 | (905) 549-9913 |
| Bricklayers' & Masons' Union 51 Wentworth St S, Hamilton L8N 2Y5 | (905) 527-8418 |
| Cep 1130 Barton St E, Hamilton L8H 2V1 | (905) 548-6966 |
| Canadian Auto Workers 307 Queenston Rd, Hamilton L8K 1H3 | (905) 545-8770 |
| Canadian Association-Broadcast 250 Main St W, Hamilton L8P 1J6 | (905) 523-8681 |
| Canadian Union-Public Employee 20 Hughson St S #710, Hamilton L8N 2A1 | (905) 522-1167 |
| Canadian Union-Public Employee 36 Hunter St E #501, Hamilton L8N 3W8 | (905) 522-0917 |
| Canadian Union-Postal Workers 1130 Barton St E #200, Hamilton L8H 7P9 | (905) 573-8700 |
| Canadian Union-Pub Empl 4153 1130 Barton St E, Hamilton L8H 2V1 | (905) 544-7733 |
| Canadian Union-Public Employee 1030 Upper James St #400, Hamilton L9C 6X6 | (905) 575-5411 |
| Canadian Union-Pub Empl 778 1130 Barton St E, Hamilton L8H 7P9 | (905) 312-1640 |
| Canadian Union-Pub Empl 3943 1130 Barton St E, Hamilton L8H 7P9 | (905) 545-5324 |
| Canadian Union-Public Employee 540 Concession St #200, Hamilton L8V 1A9 | (905) 385-4555 |
| Canadian Union-Pub Empl 786 260 Nebo Rd, Hamilton L8W 3K5 | (905) 318-9336 |
| Carpenters Union 1342 Stone Church Rd E, Hamilton L8W 2C8 | (905) 522-0752 |