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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
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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