| Business | Phone |
| A R Assoc 275 Nevada St, Auburn 95603 | (530) 888-1288 |
| Associated Engineering Consultant 124 Oakwood Dr # B, Auburn 95603 | (530) 823-9145 |
| Geil Engineering 1226 High St, Auburn 95603 | (530) 885-0426 |
| Giuliani & Kull Inc 11899 Edgewood Rd # Q, Auburn 95603 | (530) 885-5107 |
| Mac Intosh Engineering & Dev 259 Nevada St, Auburn 95603 | (530) 887-8151 |
| R & B Engineering Inc 1161 High St, Auburn 95603 | (530) 823-8420 |
| Spencer Engineering Po Box 6018, Auburn 95604 | (916) 439-6218 |
| Western Planning & Engineering 11860 Kemper Rd # 3, Auburn 95603 | (530) 823-6917 |
| Charpier Engineering 13348 Lincoln Way, Auburn 95603 | (530) 823-0594 |
| Mdb Global 13348 Lincoln Way, Auburn 95603 | (530) 886-8601 |
| Rpd & Assoc 2580 Ross Ct, Auburn 95602 | (530) 878-0524 |
| Scheller Engineering 2655 Burgard Ln, Auburn 95603 | (916) 663-9101 |
| Swift Engineering Po Box 5141, Auburn 95604 | (530) 878-6732 |
| John P Wilusz Pe Po Box 6089, Auburn 95604 | (530) 320-3721 |