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2. List of California area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_California_area_codes

   The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1949, Oakland, CA, received the fifth regional dial switching center for Operator Toll Dialing in the nation, [ 2 ] which set the stage for ...

3. Area codes 760 and 442 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_760_and_442

   Area codes 760 and 442 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. These area codes serve an overlay complex that comprises much of the southeastern and southernmost portions of California. It includes Imperial, Inyo, and Mono counties, as well as portions of San Diego, Riverside, San ...

4. Azusa, California - Wikipedia

   en.wikipedia.org/wiki/Azusa,_California

   Azusa was listed in the 1860 census as a township (encompassing the Azusa de Dalton and Azusa de Duarte ranchos) with a population of 363. The 1870 US Census listed the area as the township of Azusa – El Monte Township and 1880 US Census listed the area as the township of San Jose and Azusa. There were a few corrections to cross out the San ...

5. Area codes 408 and 669 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_408_and_669

   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.Area codes 408 and 669 are shown in red. Area codes 408 and 669 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. state of California.

6. Area codes 510 and 341 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_510_and_341

   Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in the U.S. state of California. They cover parts of Contra Costa County and western Alameda County, including the city of Oakland, but excluding Dublin, Livermore, Pleasanton, and Sunol. Area code 510 was established on ...

7. Area codes 530 and 837 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_530_and_837

   This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021. [1] On June 8, 2023, the California Public Utilities Commission assigned area code 837 to overlay 530, effective January 31, 2025. [2] 837 will serve as California's 40th area code. As ten-digit dialing is already in effect, no permissive dialing ...