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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.
609 is one of the area codes for New Jersey, covering parts of Bergen and Hudson counties. It was created in 1947 and split from 201 in 1956. See the full list of NANP area codes and their history on Wikipedia.
Learn about the history and geography of area codes 415 and 628, which cover San Francisco and its northern suburbs in California. Find out which cities and counties are in the service area of these codes and how they were created and modified over time.
Area codes 916 and 279 serve Sacramento and its suburbs in California. Area code 279 was introduced in 2018 to relieve the exhaustion of 916 numbers.
Area codes 209 and 350 are telephone area codes in California, covering parts of the Central Valley and the Sierra Foothills. Area code 209 was created in 1957 and overlaid by 350 in 2022, due to central office code exhaustion.
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.
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, service area and popular culture of area codes 619 and 858, which cover most of San Diego County in California. Find out how they were created, split and merged over time, and what cities and communities they include.