When the North American Numbering Plan changed into created by means of AT&T in 1947, the a ways northern part of California obtained region code 916, with the exclusion of the city of Sacramento, which used area code 415. California area codes have been reorganized geographically in 1950, so that 916 was assigned to a numbering plan area that comprised simplest the northeastern part from the Sierra Nevada to the Central Valley. The coastal vicinity to the west became assigned region code 415. With this modification, Sacramento turned into also changed to area code 916.

On March 1, 1959, numbering plan location 415 changed into divided in a flash-reduce (without permissive dialing duration) in which the northern part of the numbering plan area (Solano County and north thereof) acquired region code 707, which turned into California's 8th location code (in conjunction with 213, 415, 916, 714, 408, 805, and 209), and the last new vicinity code within the state until 619 was delivered in 1982.

It isn't handiest the only this sort of location codes never to have required alleviation, however it is also the most effective one of California's thirteen unique-format area codes (i.E., location codes with a 0 or 1 as their center digit, the others being 310, 510, 818 and 909, all of which, further to 619, had been introduced decades after 707's debut) not to require relief from a "new layout" vicinity code (people with 2–8 as their middle digit, which had been brought starting in 1995 while the NANP ran out of the unique layout NPAs), in spite of explosive increase within the area, in particular its southern element, in addition to the proliferation of cellular phones and pagers.

When location code 530 become cut up from area code 916 on November 1, 1997, the Dixon area become renumbered from region code 916 to 707 and switched from the Sacramento local get right of entry to and transport vicinity (LATA) into the San Francisco LATA.

In 1999, a 3-manner, -phase split of the area code 707 was scheduled by means of Pacific Bell,[1] such that a brand new area code (627) could have served most of Napa and Sonoma Counties and small portions of Marin and Mendocino Counties, while some other new region code (369) would have served Solano County, in addition to a small part of Napa County, beginning in December 2000 and October 2001, respectively. However, because of the achievement of variety pooling in maintaining numbering resources, the California Public Utilities Commission cancelled those actions on July 27, 2000.

707 Area Code

Prior to October 2021, place code 707 had smartphone numbers assigned for the relevant workplace code 988. In 2020, 988 turned into particular nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a battle for exchanges that allow seven-digit dialing. This region code turned into consequently scheduled to transition to 10-digit dialing via October 24, 2021.[2]

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