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Area code map for Wisconsin. The U.S. state of Wisconsin is serviced in five distinct numbering plan areas (NPAs) with the following area codes of the North American Numbering Plan (NANP). Area codes 414 and 715 were among the original North American area codes assigned in 1947.
602 was the original area code for Arizona, and was split in 1995 into 602, serving metropolitan Phoenix, and 520, serving the remainder of the state. [1] In 1999, 602 was split into 480, 602, and 623, [2] which were recombined in 2023. [3] 520 was split in 2001 to form area code 928. [4]
Area code 810 was split off from area code 313 on December 1, 1993, with a permissive dialing period that ended on August 10, 1994. [1] The initial numbering plan area included the counties of Oakland, Macomb, Genesee, Lapeer, St. Clair, and Sanilac as well as small sections of Saginaw, Shiawassee, Livingston, Washtenaw, and Wayne counties north of Detroit.
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 ...
Area code 876 was created on 1 May 1997, by a split of NPA 809. [1] In the process area code 809 was removed from the country and existing central office codes were reassigned with the new area code. A permissive dialing period during which central office codes could be reached with either area code began on 1 May 1997 and ended 31 July 1998 ...
The new area code was one of the first area codes not serving an entire state, but having the digit 0 in the middle position of the code. It was the only new area code created in Illinois between 1947 and the 1989 creation of area code 708. [2] In preparation of an overlay plan with the new area code 779, all calls from the 815 area needed to ...
In 1962, AT&T assigned the first N10 code in area code 510, for conversion to dial service of the Teletypewriter Exchange Service (TWX) in the United States. [2] [3] Later in the decade, the TWX dial system was extended with the new prefixes 710, 810, and 910. 710 was assigned to a region comprising the northeast of the United States (New England, New York, New Jersey, Pennsylvania, Maryland ...
Area code 586 was first proposed as an overlay for the 810 territory, to be implemented in 2000. [1] However, overlays were still a new concept at this time, and met with some resistance due to the need for ten-digit dialing. In the face of intense opposition to the overlay proposal, 586 was instead implemented as a split, with most of Macomb ...