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.
NPA
Region
262
Southeastern part of the state including Waukesha, Racine and Kenosha, except for Milwaukee County and several outlying areas served by Milwaukee County exchanges
414†
Milwaukee County and several outlying areas served by Milwaukee County exchanges.
608/353
southwestern Wisconsin, including Madison.
715†/534
Overlay complex in northern Wisconsin, including Superior, Eau Claire and Wausau.
920/274
Overlay complex in eastern Wisconsin including Green Bay, the Fox Cities, Manitowoc and Sheboygan.[1]
Notes: † original 1947 assignment
^"Area Code Relief". Public Service Commission of Wisconsin. Retrieved 28 December 2009.
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