| Business | Phone |
| Alliance Engineering 2700 Market St Ne # A, Salem 97301 | (503) 589-1727 |
| C L Youngman Inc 1375 Liberty St Se, Salem 97302 | (503) 364-8207 |
| Ch2m Hill 200 Hawthorne Ave Se # C330, Salem 97301 | (503) 378-0661 |
| Columbia-Willamette 280 Court St Ne # 13, Salem 97301 | (503) 581-5658 |
| Geocomm Mapping 565 Union St Ne # 200, Salem 97301 | (503) 763-1981 |
| H W Lochner Inc 2001 Front St Ne # 120, Salem 97303 | (503) 586-0100 |
| Interface Engineering Inc 200 Hawthorne Ave Se # B210, Salem 97301 | (503) 364-5354 |
| International Concepts Inc 1652 Wiltsey Rd Se # 25, Salem 97306 | (503) 581-2102 |
| Jms Engineering 3000 Market St Ne # 510, Salem 97301 | (503) 585-5578 |
| Sorensen & Assoc Po Box 12852, Salem 97309 | (503) 540-9000 |
| Trebor Systems Inc 2494 Coho Ave Nw, Salem 97304 | (503) 540-3141 |
| W & H Pacific 3470 Pipebend Pl Ne # 170, Salem 97301 | (503) 362-4675 |
| West Consultants Inc 2601 25th St Se # 450, Salem 97302 | (503) 485-5490 |