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  2. List of area code overlays - Wikipedia

    en.wikipedia.org/wiki/List_of_area_code_overlays

    An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) ... 424: 310: Southwestern Los Angeles County, California: 430: 903:

  3. Area codes 310 and 424 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_310_and_424

    Having been staved off nearly seven years, the overlay with 424 was finally implemented on July 26, 2006. On December 31, 2005, customers began dialing 1 + area code + seven-digit number whenever a call is placed by a caller in the 310 or 424 area code to any other area code, including 310 to 424 or 424 to 310. After July 26, 2006, customers ...

  4. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_area_codes

    On November 1, 2024, it was overlaid by area code 738. 341: overlay with 510: started service on July 22, 2019. 350: overlay with 209: ... 424: overlay with 310:

  5. Overlay complex - Wikipedia

    en.wikipedia.org/wiki/Overlay_complex

    In telecommunications, an area code overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are implemented in territories of the North American Numbering Plan (NANP) to mitigate exhaustion of central office codes in growth areas.

  6. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    424: California ... reserved as a fifth area code to overlay 905/289/365/742 with no set date of implementation; 538: not in use; available for personal ...

  7. Area codes 760 and 442 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_760_and_442

    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 North County San Diego, Riverside, San Bernardino, Los Angeles and Kern counties. Area code 760 was created on March 22, 1997 in a split of area code 619 ...

  8. Area codes 213, 323, and 738 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_213,_323,_and_738

    Area code 738 was selected as an additional overlay area code activated in November 2024. History In 1947 ... 310/424, 408/669, 415/628, 510/341, 530, ...

  9. Area codes 714 and 657 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_714_and_657

    Area code 714 was assigned to a part of numbering plan area 213 in 1951, and 657 was added in 2008 to form an overlay complex ... 213/323, 310/424, 408/669 ...