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California — United States

Welcome to the postal codes directory for California, United States. As a prominent region in United States, California contains 24 major cities indexed. Our platform provides comprehensive zip codes, neighborhood directories, and simulated local phone number generation rules for developer form testing and compliance verification.

24 Total Cities Indexed
CALIFORNIA Region Code
🔍 Showing 24 cities

Available Cities

24
Albany Bangor Bridgeport Columbia Concord Davenport Fresno Greenville Jackson Lewiston Lincoln Los Angeles Madison Manchester Meridian Newark Oakland Palo Alto Richmond Sacramento San Diego San Francisco San Jose Wilmington

Frequently Asked Questions

Regional Divisions & Cities
California encompasses diverse geographical zones and municipal areas. This platform indexes 24 major cities in California, linking each city to its postal codes, neighborhoods, and regional phone area codes.
State-Level Telecom Infrastructure
Under the NANP system, California is allocated several distinct area codes covering specific counties and metropolitan districts. Select a city to explore local dialing overlays and to generate valid mock phone patterns.
How to look up the exact postal code for a specific district or street under California?
You can select the corresponding city from the list above. On the city page, we provide a complete mapping table of districts, streets/neighborhoods, and their exact postal codes. You can also use the search bar at the top to instantly locate a street or neighborhood.