Alameda County California is covered by a total of 74 ZIP Codes. There are 11 ZIP Codes in Alameda County that extend into adjacent counties (Contra Costa County, San Joaquin County, Santa Clara County, and Stanislaus County). Of the ZIP codes within or partially within Alameda County there are 54 Standard ZIP Codes, 6 Unique ZIP Codes and 14 PO Box ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of Alameda County and can be turned on and off. Each type of postal code can also be turned on and off.