![]() The numbering plan area was split in a flash-cut on March 1, 1959, when area code 707 was created out of the northwest portion. This involved changing Sacramento from area code 415 to 916. In 1950, as part of a realignment of California's area codes, 916 was rotated to cover the northeastern corner of California, from the Sierra Nevada to the Central Valley. ![]() Originally, the plan area covered the far northern portion of the state. Map of California numbering plan areas (blue) and border states.
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