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  2. Area codes 248 and 947 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_248_and_947

    Area code 248 was created in 1997 as a split from area code 810. In 2000, area code 947 was assigned as a relief area code for the area. [ 1 ] In 2001, it was approved as an all-services overlay plan in the 248 numbering plan area, [ 2 ] requiring ten-digit dialing after end of the permissive dialing period, which started on January 26, 2002.

  3. List of Michigan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Michigan_area_codes

    This is a list of telephone area codes in the U.S. state of Michigan: 231 – Northwestern Lower Michigan : Traverse City, Ludington, Muskegon, Petoskey, Big Rapids and Cheboygan 248 – Northern Metro Detroit : All of Oakland County, Northville, and most of Northville Township; overlays with area code 947

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

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

    Michigan (Port Huron, Flint, Lapeer, and the Michigan "Thumb") December 1, 1993: used until 1981 for TWX service; split of 313; 1997: split to create 248; 2001: split to create 586; 811: Not assignable; N11 code for regional information in the US, the FCC adopted it as the local underground utility assistance service in 2007

  5. 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]

  6. Area code 989 - Wikipedia

    en.wikipedia.org/wiki/Area_code_989

    Area code 989 is a telephone area code in the North American Numbering Plan for Central Michigan, the northeastern Lower Peninsula, and portions of the Thumb. It is the highest-numbered area code in use in the North American Numbering Plan (NANP), [ 1 ] as well as the highest possible under the current system, in which a middle digit of 9 is ...

  7. Area code 586 - Wikipedia

    en.wikipedia.org/wiki/Area_code_586

    In 1997, Oakland County, bordering Macomb County to the west, was split from area code 810 as area code 248. Area code 586 was first proposed as an overlay for the 810 territory, to be implemented in 2000. [ 1 ]

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