| Business | Phone |
| Construction 116 N Green St, Ottumwa 52501 | (641) 682-1275 |
| International Union-Oper Engrs 116 N Green St, Ottumwa 52501 | (641) 684-8726 |
| Plumbers & Steamfitters Local 1140 N Jefferson St 206, Ottumwa 52501 | (641) 682-8677 |
| Southern Iowa Labor Council 116 N Green St, Ottumwa 52501 | (641) 682-3754 |
| Union Ufcw Local 230 1305 E Mary St, Ottumwa 52501 | (641) 682-2807 |
| Union-Uaw 205 N James St, Ottumwa 52501 | (641) 682-0897 |