| Locality | Post Code |
|---|---|
| Oakley, Contra Costa | 94561 |
| Orinda, Contra Costa | 94563 |
| Pacheco, Contra Costa | 94553 |
| Pinole, Contra Costa | 94564 |
| Pittsburg, Contra Costa | 94565 |
| Pleasant Hill, Contra Costa | 94523 |
| Point Richmond, Contra Costa | 94801 |
| Port Chicago, Contra Costa | 94565 |
| Port Costa, Contra Costa | 94569 |
| Richmond, Contra Costa | 94801, 94804, 94805, 94850 |
| Rodeo, Contra Costa | 94572 |
| San Pablo, Contra Costa | 94803, 94805, 94806 |
| San Ramon, Contra Costa | 94582, 94583 |
| Tara Hills, Contra Costa | 94806 |
| Walnut Creek, Contra Costa | 94595, 94596, 94597, 94598 |
| West Pittsburg, Contra Costa | 94565 |