| Business | Phone |
| Carpenters Local 1638 Central Ave, Dubuque 52001 | (563) 582-8521 |
| Dubuque Area Labor-Mgmt Councl 700 Locust St 150, Dubuque 52001 | (563) 582-8804 |
| Labor Local 659 1638 Central Ave, Dubuque 52001 | (563) 583-0686 |
| Machinist Union Local 1610 Garfield Ave, Dubuque 52001 | (563) 583-0122 |
| Operating Engineera 3430 Dodge St, Dubuque 52003 | (563) 582-0891 |
| Operating Engineers Local 234 1638 Central Ave, Dubuque 52001 | (563) 583-2521 |
| Plumbers & Steamfitters 1638 Central Ave, Dubuque 52001 | (563) 583-0150 |
| Teamsters Local Union 195 E 14th St, Dubuque 52001 | (563) 583-9149 |
| Union Labor Temple 1610 Garfield Ave, Dubuque 52001 | (563) 556-9410 |
| United Automobile Workers # 94 3450 Central Ave, Dubuque 52001 | (563) 583-1779 |
| United Food & Commercial Wrkrs 1111 Bluff St, Dubuque 52001 | (563) 556-1130 |