| Business | Phone |
| Andy Paris & Assoc Inc 16057 Boones Ferry Rd, Lake Oswego 97035 | (503) 636-3341 |
| Buford Associates Inc 415 N State St, Lake Oswego 97034 | (503) 635-3511 |
| Gilbertson Engineering 543 3rd St # C3, Lake Oswego 97034 | (503) 635-7590 |
| Hickman & Assoc Inc 1705 Lee St, Lake Oswego 97034 | (503) 697-6869 |