| Business | Phone |
| Wunderlich Malec Engineering 12180 Sw Garden Pl, Portland 97223 | (503) 620-0809 |
| Allstructure Engineering Llc 7140 Sw Fir Loop, Portland 97223 | (503) 620-4314 |
| Woolee Tech Engineering 1623 Se Bybee Blvd, Portland 97202 | (503) 232-2713 |
| Tampa Bay Engineering 1300 Sw 5th Ave # 18, Portland 97201 | (503) 471-3043 |
| Gausman & Moore Associates, Inc. 1750 SW Skyline Blvd Ste 201, Portland 97221 | (503) 203-1128 |
| Northwest Resistance Gen Engr 1540 Se Clinton St, Portland 97202 | (503) 239-6841 |
| New Paradigm Engineering 4605 Ne Fremont St # 209b, Portland 97213 | (503) 459-4169 |
| Hdr Engineering Inc 1001 Sw 5th Ave # 1800, Portland 97204 | (503) 423-3700 |
| Ishimoto America Inc 2020 Sw 4th Ave # 3, Portland 97201 | (503) 224-4913 |
| Mahedy Sexton Engineering Svc 7472 N Stockton Ave, Portland 97203 | (503) 285-1636 |
| English Engineering 13705 Nw Mclain Way, Portland 97229 | (503) 641-1500 |