Area codes 916 and 279, Telephone prefix in Sacramento region, California, US
Area codes 916 and 279 cover the Sacramento metropolitan region, linking communities across El Dorado, Placer, Sacramento, Sutter, and Yolo counties. The 279 prefix was added later as an overlay to meet growing demand for telephone numbers, and both codes share the same geographic footprint in north-central California.
The 916 prefix was established in 1947 as one of California's first three codes, initially covering all of northeastern California. Over the decades, its territory shrank through several splits, until 279 was introduced in 2018 as a second option for the same region.
The telephone prefix system shapes regional identity by connecting residents across multiple counties while maintaining Sacramento's position as the communication center.
Dialing any number in this region requires the full ten-digit format, even when calling someone who shares your prefix. Emergency calls to 911 and other three-digit services still work as usual without the extra digits.
Unlike most early prefixes, 916 shrank so much through later splits that none of its original 1947 territory remains within its boundaries today. Even the current core around Sacramento fell outside the code's first borders.
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