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  2. Area codes 408 and 669 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_408_and_669

    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 ...

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

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

    prior to 1991, was the area code for Mexico City; split of 416; 2001: overlaid by 289; 2013: overlaid by 365; 2021: overlaid by 742 [8] 537 reserved as a fifth area code for the region. 906: Michigan (Upper Peninsula: Sault Ste. Marie, Escanaba, Houghton, Iron Mountain, Marquette, Menominee, etc.) March 19, 1961: split of 616; 907

  4. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_area_codes

    Much of the City of Los Angeles and several inner suburbs: originally split off from 213 to form a ring around downtown Los Angeles and the city of Montebello on June 13, 1998; in August 2017, the boundary between 213 and 323 was erased to form an overlay. On November 1, 2024, it will also be overlaid by area code 738. 341: overlay with 510

  5. List of area code overlays - Wikipedia

    en.wikipedia.org/wiki/List_of_area_code_overlays

    In addition to being the sole area code in the Space Coast region around the Kennedy Space Center, this is the only partial overlay area code in North America 323: 213: Central Los Angeles, incl. Downtown L.A. and Hollywood: 326: 937: Southwest Ohio: 331: 630: Western suburbs of Chicago: 332, 646 , 917: 212

  6. Area codes 707 and 369 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_707_and_369

    Major cities in the area codes include Napa, Sebastopol, Vallejo, Benicia, Fairfield, Santa Rosa, Windsor, Healdsburg, Rohnert Park, Petaluma, Fort Bragg, Rio Vista, Crescent City, Eureka, Clearlake, Vacaville, Dixon, and Ukiah. 707 was created by a split of area code 415 on March 1, 1959. Area code 369 was added to the numbering plan area (NPA ...

  7. Area codes 415 and 628 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_415_and_628

    On March 1, 1959, area code 707 was created from the northern part, and area code 408 was created for San Jose, the South Bay, the Monterey Bay, and the Salinas Valley. [5] (408 has since been split to 831 and overlaid with 669.) On September 2, 1991, area code 510 was created for the East Bay, including Oakland.

  8. 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 ...

  9. List of Washington (state) area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Washington_(state...

    Further splits in 1995 to create area code 360 for most of Western Washington, and 1997 to form area codes 253 and 425. 564 will be added to the 206 area in 2025. 509: January 1, 1957 [1] Eastern Washington, including Spokane, the Tri-Cities, Yakima, Walla Walla, and Wenatchee: Created in a split from area code 206. [2] 360: January 15, 1995 [3]