| Business | Phone |
| County Treasurer 1195 3rd St # 108, Napa 94559 | (707) 253-4320 |
| Napa County Assessor 1127 1st St # 128, Napa 94559 | (707) 253-4466 |
| Napa County Auditor-Controller 1195 3rd St # B10, Napa 94559 | (707) 253-4551 |
| Napa County Tax Collector 1195 3rd St # 108, Napa 94559 | (707) 253-4311 |