| Business | Phone |
| Design Pro Inc 3967 E Calvary Rd, Duluth 55803 | (218) 728-9481 |
| Duluth Steel Fabricators Inc 5900 Main St, Duluth 55807 | (218) 624-5793 |
| Duluth Steel Tanks Co 5816 Ryan Rd, Duluth 55804 | (218) 525-1016 |
| Fire Lite Inc 2232 W 1st St, Duluth 55806 | (218) 727-7686 |
| Kraemer Steel Sales 5821 Old Highway 61, Duluth 55810 | (218) 624-5667 |
| Superior Steel Inc 1227 Port Terminal Rd, Duluth 55802 | (218) 722-5228 |