| Business | Phone |
| American Postal Workers Union 6845 Howdershell Rd, Hazelwood 63042 | (314) 731-5400 |
| Asbestos Workers Local 1 3325 Hollenberg Dr, Hazelwood 63044 | (314) 291-7399 |
| United Auto Aerospace Workers 721 Dunn Rd, Hazelwood 63042 | (314) 731-2800 |
| United Auto Workers-America 7195 N Lindbergh Blvd, Hazelwood 63042 | (314) 731-0324 |
| Uaw 9144 Pershall Rd, Hazelwood 63042 | (314) 731-0490 |
| Office & Pro Employees Intl 3460 Hollenberg Dr, Hazelwood 63044 | (314) 298-1133 |
| National Post Office Mail Hndl 5800 Phantom Dr, Hazelwood 63042 | (314) 895-9598 |
| Missouri Union Of Law 5976 Howdershell Rd, Hazelwood 63042 | (314) 731-1105 |
| Local 513 Fringe Benefit 3449 Hollenberg Dr, Hazelwood 63044 | (314) 739-5410 |
| International Association-Mach 212 Utz Ln, Hazelwood 63042 | (314) 731-0603 |
| International Union-Oper Engrs 3449 Hollenberg Dr, Hazelwood 63044 | (314) 739-3983 |
| Hoisting Engineers Pension 3449 Hollenberg Dr, Hazelwood 63044 | (314) 739-2973 |
| Brotherhood Of Locomotive 320 Brookes Dr # 115, Hazelwood 63042 | (314) 895-5858 |
| Communications Workers-America 3550 Mckelvey Rd # 200a, Hazelwood 63044 | (314) 739-1124 |