California uses multiple telephone area codes across major cities and regions throughout the state. Use the directory below to access individual California area code pages with location, major cities, time zone, introduction date and related code information.
About California Area Codes
Area Codes Atlas currently lists 41 published area code pages associated with California. Use the directory above to open each code page and review its location, listed cities, time zone, introduction date, and related or overlay code information. The published records for California currently include Pacific time zone information. The introduction-year data in the current directory ranges from 1947 to 2025.
Cities Listed for California Area Codes
Cities appearing in the current California area-code records include South San Francisco, Agoura Hills, Anaheim, Apple Valley, and Barstow. The exact cities vary by area code, so open an individual code page for its full city list.
California Area Code Time Zones
The published California area-code records in this directory currently use Pacific. Always check the individual area-code page when you need the time zone for a specific code.
Frequently Asked Questions About California Area Codes
How many California area codes are listed?
Area Codes Atlas currently has 41 published area code pages associated with California.
Which cities are listed for California area codes?
Current records include cities such as South San Francisco, Agoura Hills, Anaheim, Apple Valley, Barstow, and Beverly Hills. City coverage differs by area code, so use the directory above for code-specific details.
What time zones are used by California area codes?
The current published records include Pacific. Open a specific area-code page to confirm its listed time zone.
How can I find information about a specific California area code?
Select an area code from the directory above. Each code page includes the available location, city, time zone, introduction-date, related-code, and dialing information.
Counts, cities, time zones, and introduction-year summaries on this page are generated from the current published Area Codes Atlas directory and may change as the directory is updated.