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Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes. In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes.
However, if you get a call from a phone number or area code you don’t know, it’s likely best to avoid picking up the call and research the following before you call back:
Until the late 1970s, central office code protection was maintained between area codes 415 and 408, so that Telephone numbers were not duplicated across, and subscribers could dial seven-digit San Francisco or Berkeley numbers without dialing an area code. Population growth, facsimile machines, and pagers caused demands for numbers to outrun ...
This feature group 'B' has been rendered obsolete by 1010xxx "dial-around" feature group 'D', but the exchange remains reserved in each individual area code. 951: California (western Riverside County, including Riverside, Corona, California, Lake Elsinore, Mira Loma, Moreno Valley, Sun City, Temecula, Winchester, Lakeview, etc.) July 17, 2004
Area codes 714 and 657 are telephone area codes in the North American Numbering Plan (NANP) for the southern part of the U.S. state of California. The numbering plan area comprises northern Orange County , a portion of Los Angeles County , and the Sleepy Hollow and Carbon Canyon areas of Chino Hills in San Bernardino County .
This map is clickable; click on any region shown to visit the page for those area codes.Area code 916 is shown in red. Area codes 916 and 279 are California telephone area codes that serve Sacramento, the state capital, and most of its suburbs. Area code 916 was one of the first three original area codes established in California in October 1947.
In 1947, when the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes, the state of California was divided into three numbering plan areas: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [1]
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