| Locality | Post Code |
|---|---|
| American Canyon, Napa | 94503 |
| Angwin, Napa | 94508 |
| Calistoga, Napa | 94515 |
| Deer Park, Napa | 94576 |
| Napa, Napa | 94558, 94559 |
| Oakville, Napa | 94562 |
| Pope Valley, Napa | 94567 |
| Rutherford, Napa | 94573 |
| Saint Helena, Napa | 94574 |
| Spanish Flat, Napa | 94558 |
| Vallejo, Napa | 94503 |
| Yountville, Napa | 94599 |