| Business | Phone |
| Cal Star Smog 3451 I St # 94, North Highlands 95660 | (916) 331-5071 |
| A & A Test Only 2745 Elkhorn Blvd, North Highlands 95660 | (916) 344-3700 |
| A Plus Smog & Oil Change 5645 Watt Ave, North Highlands 95660 | (916) 334-6797 |
| Amigo Auto Repair & Smog 5849 Watt Ave, North Highlands 95660 | (916) 332-9147 |
| Auto Inspection & Svc 2989 Orange Grove Ave, North Highlands 95660 | (916) 485-4757 |
| California Test Only Center 6305 Watt Ave # 104, North Highlands 95660 | (916) 338-1826 |
| In & Out Smog 6421 Watt Ave, North Highlands 95660 | (916) 334-1748 |
| Vip Smog Inc 3245 Elkhorn Blvd # 9, North Highlands 95660 | (916) 332-6209 |
| Smog Depot 7460 Watt Ave, North Highlands 95660 | (916) 332-9900 |
| Smog Diagnostic Specialist 6101 Watt Ave, North Highlands 95660 | (916) 344-4866 |
| Sam's Auto Repair & Svc 6001 Watt Ave, North Highlands 95660 | (916) 332-7488 |