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Post Offices by County

CONTRA COSTA COUNTY, CALIFORNIA

ZIP Code Post Office Date Established Date Discontinued
94507 ALAMO 05/18/1852
94509 ANTIOCH 01/18/1855
94511 BETHEL ISLAND 08/16/1947
BETHELL 12/27/1897 10/31/1902
94513 BRENTWOOD
94514 BYRON
94516 CANYON 08/23/1922
94517 CLAYTON 10/04/1861
94520 CONCORD 03/28/1872
94525 CROCKETT
94528 DIABLO 12/08/1916
94548 KNIGHTSEN
94549 LAFAYETTE 03/02/1857
94556 MORAGA
94561 OAKLEY
94563 ORINDA 11/15/1945
94564 PINOLE 08/29/1878
94565 PITTSBURG 12/01/1868
94569 PORT COSTA
94802 RICHMOND 06/29/1900
94572 RODEO
94583 SAN RAMON 11/20/1852
94596 WALNUT CREEK 12/01/1862

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