| Business | Phone |
| Brown Engineering 3916 W Lakeview Rd, Stillwater 74075 | (405) 372-4848 |
| Gose & Assoc 113 E 8th Ave, Stillwater 74074 | (405) 743-4907 |
| Gregory Geotechnical 2001 W 44th Ave, Stillwater 74074 | (405) 747-8200 |
| Stillwater Engineering Inc 923 S Lowry St, Stillwater 74074 | (405) 743-3355 |