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  2. 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]

  3. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

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

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

    Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.

  5. Area code 564 - Wikipedia

    en.wikipedia.org/wiki/Area_code_564

    Area code 564 is a telephone overlay area code in the North American Numbering Plan (NANP) for Western Washington state, including metropolitan Seattle. The area code was first proposed in 1999 to relieve telephone number shortages in area code 360 , but implementation was delayed until 2017, when it was installed for an overlay complex that ...

  6. Area code 262 - Wikipedia

    en.wikipedia.org/wiki/Area_code_262

    Area code 262 is a telephone area code in the North American Numbering Plan for the southeastern part of the U.S. state of Wisconsin. The numbering plan area comprises suburbs that are a part of the Milwaukee and Chicago metropolitan areas. The area code was created on September 25, 1999, in an area code split of area code 414.

  7. Category:Area codes in Washington (state) - Wikipedia

    en.wikipedia.org/wiki/Category:Area_codes_in...

    List of Washington (state) area codes; 0–9. Area code 206; Area code 253; Area code 360; Area code 425; Area code 509; Area code 564

  8. Lists of North American area codes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_North_American...

    The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes

  9. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Area code dialing is optional in most geographical area codes, except Moscow (area codes 495, 498, 499); it is mandatory for non-geographical area codes. E.123 international and Microsoft formats are used for writing local phone numbers as well; international prefix and country code 7 are replaced with trunk code 8 (or 8~CC ) when dialing a ...

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