| Issues & Consumer Affairs | 800-275-8777 | |
| Express Mail Tracking-International | | |
| Inquiries & Claims Status-Signature | | |
| & Delivery Confirmation | 800-222-1811 | |
| TTY For Speech & Hearing Impaired | 877-889-2457 | |
| Stamps By Phone | 800-782-6724 | |
| US Postal Inspectors | 877-876-2455 | |
Antioch Post Office
2730 W Tregallas Rd
Antioch 94509 | 925-757-0379 |  B |
Bethel Island Post Office
6444 Bethel Island Rd
BethelIsland 94511 | 925-684-2561 | C |
Brentwood Post Office
18 Oak
Brentwood 94513 | 925-240-2065 | D |
Byron Post Office
3852 Main
Byron 94514 | 925-634-2600 | E |
Canyon Post Office
99 Pinehurst Rd
Canyon 94516 | 925-376-5600 | F |
Clayton Post Office
6150 Center
Clayton 94517 | 925-672-4337 | G |
Concord
2121 Meridian Pk Bl
Concord 94520 | 925-687-0533 | H |
Main Post Office
2605 Camino Tassajara
Danville 94526 | 925-736-0775 | I |
Retail Store
23 Railroad Av
Danville 94526 | 925-314-9650 | J |
Diablo Post Office
1701 El Nido
Diablo 94528 | 925-837-3800 | K |
Dublin Post Office
6937 Village Pkwy
Dublin 94568 | 925-828-2689 | L |
Knightsen Post Office
3109 Knightsen Av
Knightsen 94548 | 925-625-2724 | M |
Main Post Office
3641 Mt Diablo Bl
Lafayette 94549 | 925-283-8229 | N |
Carrier Annex
3426 Mt Diablo Bl
Lafayette 94549 | 925-962-6955 | O |
Main Post Office
4100 Alhambra Av
Martinez 94553 | 925-228-2722 | P |
Court Station Post Office
815 Court
Martinez 94553 | 925-229-4795 | Q |
Pacheco Post Office
4980 Pacheco Bl
Martinez 94553 | 925-228-2722 | R |
Main Post Office
460 Center
Moraga 94556 | 925-376-9012 | S |
Saint Mary's Post Office
1928 Saint Marys
Moraga 94556 | 925-376-0739 | T |
Orinda Post Office
29 Orinda Wy
Orinda 94563 | 925-254-6240 | U |
Pleasant Hill Post Office
1945 Contra Costa Bl
PleasantHill 94523 | 925-609-8063 | V |
Main Post Office
2070 N Broadway
WalnutCreek 94596 | 925-935-0256 | W |
Rossmoor Post Office
1221 Rossmoor Pkwy
WalnutCreek 94595 | 925-933-4118 | X |
Tice Valley Post Office
1922 Tice Valley Bl
WalnutCreek 94595 | 925-947-0195 | Y |
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