| Business | Phone |
| Afscme Council 96 211 W 2nd St # 205, Duluth 55802 | (218) 722-0577 |
| American Postal Workers Union 215 N Central Ave, Duluth 55807 | (218) 624-3371 |
| Bricklayers & Tile Setters 2002 London Rd # 117, Duluth 55812 | (218) 724-8374 |
| Building & General Laborers 2002 London Rd # 115, Duluth 55812 | (218) 728-5151 |
| Cement Masons & Plasterers 2002 London Rd, Duluth 55812 | (218) 724-2323 |
| Duluth Federation Of Teachers 639 E Central Entrance, Duluth 55811 | (218) 722-1735 |
| Education Minnesota 639 E Central Entrance, Duluth 55811 | (218) 723-2306 |
| Heat & Frost Insulators/Asbes 2002 London Rd, Duluth 55812 | (218) 724-3223 |
| Ibew 2002 London Rd # 105, Duluth 55812 | (218) 728-4248 |
| International Engineers 2002 London Rd # 112, Duluth 55812 | (218) 724-3840 |
| Iron Workers 2002 London Rd # 116, Duluth 55812 | (218) 724-5073 |
| Mail Handlers 2800 W Michigan St, Duluth 55806 | (218) 723-1012 |
| Minnesota Pipe Trades 4402 Airpark Blvd, Duluth 55811 | (218) 786-0309 |
| National Assn-Letter Carriers 2800 W Michigan St, Duluth 55806 | (218) 727-4327 |
| Painters 2002 London Rd # 106, Duluth 55812 | (218) 724-6466 |
| Plumbers & Steamfitters Union 4402 Airpark Blvd, Duluth 55811 | (218) 727-2199 |
| Retail Food Health Benefit Pln 2002 London Rd # 300, Duluth 55812 | (218) 728-4231 |
| Teamsters & Dairies Employees 2802 W 1st St, Duluth 55806 | (218) 628-1034 |
| Teamsters Health Fund 5912 Waseca St, Duluth 55807 | (218) 727-0824 |
| Union Of Needle Trade Ind 2027 W Superior St, Duluth 55806 | (218) 722-1220 |