| Business | Phone |
| Afl-Cio 2015 W Western Ave, South Bend 46629 | (574) 288-8613 |
| American Postal Workers Union 424 S Michigan St, South Bend 46601 | (574) 289-9854 |
| Bac Processing Office 1657 Commerce Dr, South Bend 46628 | (574) 287-4614 |
| Bricklayers State Apprentice 2110 Schulman Dr, South Bend 46619 | (574) 232-4097 |
| Carpenters 315 N Lafayette Blvd, South Bend 46601 | (574) 233-2138 |
| Cement Masons 1345 Northside Blvd, South Bend 46615 | (574) 234-3499 |
| International Union-Bricklayer 1226 Emerson Ave, South Bend 46615 | (574) 289-5151 |
| Iron Workers Union 3515 Boland Dr, South Bend 46628 | (574) 288-9033 |
| Iue Local 809 1609 Ford St, South Bend 46619 | (574) 234-7712 |
| National Assn-Letter Carriers 1635 N Ironwood Dr, South Bend 46635 | (574) 277-3062 |
| Painters & Decorators-America 1345 Northside Blvd, South Bend 46615 | (574) 287-8200 |
| Plumbers & Pipe Fitters 4172 Ralph Jones Ct, South Bend 46628 | (574) 273-0500 |
| Roofers 1345 Northside Blvd, South Bend 46615 | (574) 288-6506 |
| Sheet Metal Workers Joint 2605 S Main St, South Bend 46614 | (574) 287-8728 |
| South Bend Firefighters 1122 S Main St, South Bend 46601 | (574) 232-3473 |
| Teamsters 2405 Edison Rd, South Bend 46615 | (574) 234-6031 |
| Uaw 740 S Michigan St, South Bend 46601 | (574) 289-5825 |
| Uaw Local 5 Amalgamated 1426 S Main St, South Bend 46613 | (574) 289-5551 |
| United Food & Commercial Wrkrs 2216 Mishawaka Ave, South Bend 46615 | (574) 233-3311 |
| United Government Security 401 S Michigan St, South Bend 46601 | (574) 289-6137 |