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Area code 323 covers much of the City of Los Angeles and several inner suburbs, originally split off from 213 in 1998. It will be overlaid by area code 738 in 2024. See the full list of California area codes and their service areas.
Learn about the history, assignment, and operation of toll-free telephone numbers in the North American Numbering Plan, which have the area code prefixes 800, 833, 844, 855, 866, 877, and 888. Find out how to call or get a toll-free number in the U.S. or Canada, and what are the special cases and restrictions.
The North American Numbering Plan (NANP) is a telephone numbering system for twenty-five regions in twenty countries, mainly in North America and the Caribbean. It uses the country code 1 and divides the territories into numbering plan areas (NPAs) with three-digit area codes.
Learn about the types, structures and formats of telephone numbers in different regions and networks. The International Telecommunication Union (ITU) has established a comprehensive numbering plan, E.164, for uniform interoperability of the networks of its member states or regional administrations.
Area codes 310 and 424 are telephone area codes in California for the West Los Angeles and South Bay areas of Los Angeles County, a small portion of Ventura County, and Santa Catalina Island. Learn about the history, splits, overlay controversy, and service area of these codes.
All-number calling (ANC) is a telephone numbering plan that replaced the previous system of using a telephone exchange name as the first part of a telephone number. Learn how ANC was introduced, how it increased the number of available central office codes, and how it was accepted or resisted by users.
Learn about the history and geography of the telephone area codes 408 and 669 in the San Jose area of California. Find out how to dial and what prefixes are used for different cities and communities.
Learn about the history and coverage of the Sacramento area codes 916 and 279, which serve the state capital and its suburbs. Find out which towns and cities are in each area code and how to dial locally or long distance.