| Business | Phone |
| North Counties Engineering Co 425 Talmage Rd, Ukiah 95482 | (707) 462-1961 |
| Rau & Assoc Inc 100 N Pine St, Ukiah 95482 | (707) 462-6536 |
| Ruzicka Associates 107 W Perkins St, Ukiah 95482 | (707) 468-3886 |
| Franz Engineering 2335 Appolinaris Dr, Ukiah 95482 | (707) 462-1087 |
| Mendocino Engineering Inc 505 Cypress Ave, Ukiah 95482 | (707) 462-9372 |