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  2. Area codes 202 and 771 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_202_and_771

    Area codes 202 and 771 are telephone area codes in the North American Numbering Plan (NANP) for Washington, D.C. Area code 202 was one of the original North American area codes established in October 1947 by AT&T. After the State of New Jersey with area code 201, the District of Columbia was the second numbering plan area (NPA). Area code 771 ...

  3. 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]

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

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

    2023: returned to the pool of area codes available for future area code relief; 457: Louisiana (Shreveport–Bossier City, Monroe, Alexandria, Fisher, Tallulah, and most of northern Louisiana) September 25, 2025 [3] to be overlaid on 318; previously a fictitious area code assigned to identify Naked DSL/Dry Loop and dedicated data lines in ...

  5. List of Washington area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Washington_area_codes

    List of Washington area codes may refer to: List of Washington (state) area codes; List of Washington, D.C., area codes This page was last edited on 23 ...

  6. File:Area code 202.svg - Wikipedia

    en.wikipedia.org/wiki/File:Area_code_202.svg

    Schematic map showing (in red) geographical area of District of Columbia serving area codes 202/771 and surrounding areas in Maryland 240/227/301 and Virginia 571/703 US area codes. This has been updated to cover latest area code information for DC, Maryland and Virginia adjacent area codes as of 2023-06-28.

  7. List of area code overlays - Wikipedia

    en.wikipedia.org/wiki/List_of_area_code_overlays

    An area code overlay is a numbering plan area ... Western suburbs of Chicago: 332, 646 , 917: 212: New York City borough of Manhattan, ... 202: Washington, D.C. ...

  8. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    In 1948, northern Indiana received an extra area code for its Chicago suburbs by dividing area code 317. [22] In 1950, southwest Missouri, with a new toll-center in Joplin, received area code 417, a change that provided more central offices in Kansas City.

  9. Central office code protection - Wikipedia

    en.wikipedia.org/wiki/Central_office_code_protection

    In large cities located directly on area code boundaries (such as Ottawa-Hull in 613/819, the sixth-largest Canadian metropolitan area), this can lead to a situation where none of the many vacant prefixes can be assigned without breaking seven-digit calling across the area code boundary. Code protection in Ottawa-Hull broke down in 2006 for ...

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