| Business | Phone |
| Sparling 111 Sw 5th Ave, Portland 97204 | (503) 273-0060 |
| Reyes Engineering 6126 Se Duke St, Portland 97206 | (503) 772-1544 |
| Dhillon Engineers Inc 4504 Sw Corbett Ave # 200, Portland 97239 | (503) 228-2877 |
| Edel Engineering 3519 Se 71st Ave, Portland 97206 | (503) 771-4788 |
| Pae Consulting Engineers Inc 808 Sw 3rd Ave # 300, Portland 97204 | (503) 226-2921 |
| Mke & Assoc Inc 6915 Sw Macadam Ave # 200, Portland 97219 | (503) 892-1188 |
| M & M Electrical 6701 Se Foster Rd, Portland 97206 | (503) 771-8200 |
| Cundiff Engineering Inc 8885 Sw Canyon Rd # 205, Portland 97225 | (503) 297-7738 |
| Elcon Associates Inc 12670 Nw Barnes Rd # 2, Portland 97229 | (503) 644-2490 |