ZIP Code 94523 is located in the county of Contra Costa in the state of California. 94523 ZIP Code is spread between the coordinates of +37.9533825 Latitude and -122.07385914 Longitude. 94523 ZIP Code is part of the 925 area code. There is 1 postal office in zip code 94523.
On the below highlighted section you can find the cities which the US Post Office accepts for ZIP code 94523. Always when you mail a package or a letter, be attentive to mention the preferred or acceptable cities. Using any city in the list of unacceptable cities may result in unforseen delays.