| Business | Phone |
| 4b Engineering & Consulting 3000 Market St Ne, Salem 97301 | (503) 589-1115 |
| Coefficient 3734 Felton St S, Salem 97302 | (503) 316-3416 |
| Ddg Engineering Inc 2843 Hoover Ave Nw, Salem 97304 | (503) 589-4713 |
| H & R Engineering Inc 690 Loring Dr Nw, Salem 97304 | (503) 581-9272 |
| Pioneer Engineering Corp 4025 Copper Glen Ct Se, Salem 97302 | (503) 391-2349 |
| Quincy Engineering Inc 200 Hawthorne Ave Se, Salem 97301 | (503) 763-9994 |