| Business | Phone |
| Afi Assoc Inc 2107 Nw Fillmore Ave, Corvallis 97330 | (541) 757-0349 |
| Boire Assoc Inc 520 Nw 4th St, Corvallis 97330 | (541) 753-5344 |
| Cascade Consulting Assoc Inc 1128 Ne 2nd St, Corvallis 97330 | (541) 753-0117 |
| Cascade Consulting Assoc Inc 720 Nw 2nd St # 101, Corvallis 97330 | (541) 753-0117 |
| Ch2m Hill 2300 Nw Walnut Blvd, Corvallis 97330 | (541) 752-4271 |
| Clair Co Inc 525 Nw 2nd St # 3, Corvallis 97330 | (541) 758-1302 |
| David Evans & Assoc Inc 1128 Ne 2nd St # 201, Corvallis 97330 | (541) 754-0043 |
| Eesi 687 Nw 5th St, Corvallis 97330 | (541) 754-1062 |
| Endex Engineering Inc 233 Nw 2nd St, Corvallis 97330 | (541) 754-9517 |
| Firp Technology Inc 6300 Sw Reservoir Ave, Corvallis 97333 | (541) 929-3781 |
| Forest Engineering Inc 620 Sw 4th St, Corvallis 97333 | (541) 754-7558 |
| Gordon & Assoc Inc 508 Sw Jefferson Ave, Corvallis 97333 | (541) 757-7514 |
| Kmh Project Development Svc 4000 Nw Princess St, Corvallis 97330 | (541) 757-3144 |
| Lucidyne Technologies Inc 155 Sw Madison Ave, Corvallis 97333 | (541) 753-5111 |
| Mater Engineering Ltd 101 Sw Western Blvd, Corvallis 97333 | (541) 753-7335 |
| Triaxis Engineering Inc 1600 Sw Western Blvd # 100, Corvallis 97333 | (541) 766-4600 |
| Trimmer Engineering 3924 Nw Walnut Pl, Corvallis 97330 | (541) 754-2819 |
| Trimmer Engineering 800 Nw Starker Ave # 26, Corvallis 97330 | (541) 754-2819 |