California currently utilizes 37 area codes. When first established by AT&T and the Bell System in 1947, 213 covered southern California including Los Angeles, 415 covered northern/central California including San Francisco and Sacramento, and 916 covered northern California but not including Sacramento. The most recently added was 350 in 2022 as an overlay to 209. Today, 760 is the most populated with an estimated 5.7 million of the state's 37.3 million residents.
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279 is an overlay for area code 916.
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323 is an overlay for area code 213.
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341 is an overlay for area code 510.
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350 is an overlay for area code 209.
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424 is an overlay for area code 310.
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442 is an overlay for area code 760.
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628 is an overlay for area code 415.
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657 is an overlay for area code 714.
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669 is an overlay for area code 408.
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747 is an overlay for area code 818.
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820 is an overlay for area code 805.
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840 is an overlay for area code 909.
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858 is an overlay for area code 619.
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