| Business | Phone |
| Pac Land 6400 Se Lake Rd # 300, Portland 97222 | (503) 659-9500 |
| Welkin Engineering Pc 8000 Sw Pfaffle St, Portland 97223 | (503) 598-1866 |
| Alpha Community Development 9600 Sw Oak St # 230, Portland 97223 | (503) 452-8003 |
| Technical Engineering Corp 8835 Sw Canyon Ln, Portland 97225 | (503) 297-3721 |
| Wilbanks King Intl 9220 Sw Barbur Blvd # 119-337, Portland 97219 | (503) 246-4053 |
| Wrg Design Inc 5415 Sw Westgate Dr # 100, Portland 97221 | (503) 419-2500 |
| Z Tec Engineers 3737 Se 8th Ave, Portland 97202 | (503) 235-8795 |
| Symons Engineering Consultants 12805 Se Foster Rd, Portland 97236 | (503) 760-1353 |
| Burton Engineering Assoc 10121 Ne Glisan St, Portland 97220 | (503) 251-2947 |
| Rowell Engineering & Design 10570 Se Washington St # 210, Portland 97216 | (503) 254-6292 |
| Cnf Consulting 5630 Sw Macadam Ave # 4, Portland 97239 | (503) 246-1200 |
| D K Whitaker Engineering 4325 Ne Failing St, Portland 97213 | (503) 281-5544 |
| D L Design Inc 9045 Sw Barbur Blvd # 101, Portland 97219 | (503) 225-1679 |
| Parsons Rci Construction 501 Nw 3rd Ave, Portland 97208 | (503) 274-0535 |
| Murray Smith & Assoc Inc 121 Sw Salmon St # 900, Portland 97204 | (503) 225-9010 |
| Lan Pacific Inc 1001 Se Water Ave # 360, Portland 97214 | (503) 238-2097 |
| Don Cushing Assoc Inc 6656 Sw Hampton St, Portland 97223 | (503) 620-7884 |
| Land Tech Inc 8835 Sw Canyon Ln # 402, Portland 97225 | (503) 291-9398 |
| J H Sigmund Consulting Engr 8835 Sw Canyon Ln # 402, Portland 97225 | (503) 292-5825 |