| Business | Phone |
| Alta Vista Systems 3514 Alta Vista Ave, Santa Rosa 95409 | (707) 542-5421 |
| Bp Engineering 5511 Monte Verde Dr, Santa Rosa 95409 | (707) 539-3904 |
| Brunsing Associates Inc 5468 Skylane Blvd, Santa Rosa 95403 | (707) 838-3027 |
| Ch2m Hill 2200 Range Ave # 106, Santa Rosa 95403 | (707) 568-5300 |
| Engineering Consulting 4756 Starbuck Ave, Santa Rosa 95409 | (707) 539-4756 |
| Engineering Design & Testing 3624 Airway Dr, Santa Rosa 95403 | (707) 578-9030 |
| Enterra Associates Inc 850 2nd St # F, Santa Rosa 95404 | (707) 544-6351 |
| Industrial Power Technology 2227 Capricorn Way # 101, Santa Rosa 95407 | (707) 528-8900 |
| Kleinfelder 2240 Northpoint Pkwy, Santa Rosa 95407 | (707) 571-1883 |
| Landerville & Assoc 1260 N Dutton Ave # 240, Santa Rosa 95401 | (707) 546-8222 |
| Mead & Hunt Inc 707 Aviation Blvd, Santa Rosa 95403 | (707) 526-5010 |
| James S Mitchell Pe 520 Mendocino Ave # 234, Santa Rosa 95401 | (707) 546-8102 |
| Mosier Engineering & Surveying 843 2nd St, Santa Rosa 95404 | (707) 535-0902 |
| North Bay Micro Inc 5701 Evening Way, Santa Rosa 95409 | (707) 539-3292 |
| Private I Squared 122 Calistoga Rd # 199, Santa Rosa 95409 | (707) 539-2992 |
| Privateer Rds 1620 Herbert St # 24, Santa Rosa 95401 | (707) 545-5187 |
| Reltek Llc 2345 Circadian Way, Santa Rosa 95407 | (707) 284-8808 |
| Renner Surveying & Engineering 3270 Mendocino Ave # 2e, Santa Rosa 95403 | (415) 883-0775 |
| Sophrosyne Systems Po Box 5679, Santa Rosa 95402 | (707) 794-7291 |
| Therma Source Inc 725 Farmers Ln # 8, Santa Rosa 95405 | (707) 523-2960 |
| Val E Pizzini Structural Dsgn 3000 Cleveland Ave # 201, Santa Rosa 95403 | (707) 527-9802 |
| Winzler & Kelly 495 Tesconi Cir, Santa Rosa 95401 | (707) 523-1010 |
| Z Domain Technologies Santa Rosa 95403 | (707) 591-9620 |