| Business | Phone |
| Ayres Associates 2711 W Superior St, Duluth 55806 | (218) 722-7131 |
| Barr Engineering 332 W Superior St # 600, Duluth 55802 | (218) 727-5218 |
| Bovee & Assoc 2025 Water St, Duluth 55812 | (218) 525-4300 |
| Foster Jacobs & Johnson Inc 345 Canal Park Dr # 200, Duluth 55802 | (218) 722-3060 |
| Lake Superior Consulting 130 W Superior St # 710, Duluth 55802 | (218) 727-3141 |
| Laurentian Engineering Group 10 W Superior St # 232, Duluth 55802 | (218) 733-9999 |
| Metatech Corp 5 W 1st St # 301, Duluth 55802 | (218) 727-2666 |
| Meyer Borgman & Johnson 10 W Superior St, Duluth 55802 | (218) 722-1056 |
| Msa Professional Svc 301 W 1st St # 408, Duluth 55802 | (218) 722-3915 |
| Poliac Research Corp 205 W 2nd St, Duluth 55802 | (218) 722-8098 |
| Reynolds Smith & Hills Inc 4525 Airport Approach Rd # A, Duluth 55811 | (218) 722-1227 |
| Rlk Kuusisto Ltd 4511 W 1st St # 3, Duluth 55807 | (218) 720-6219 |
| Safety Engineering Experts Duluth 55804 | (218) 525-2388 |
| Short Elliott Hendrickson 418 W Superior St # 200, Duluth 55802 | (218) 722-0547 |
| T Farms Consulting 1617 E 2nd St # C, Duluth 55812 | (218) 724-5034 |