The U.S. state of Wisconsin is serviced in five geographically distinct numbering plan areas (NPAs) in the North American Numbering Plan (NANP) with the following area codes. Area codes 414 and 715 were among the original North American area codes assigned in 1947.
Area code Year ParentNPA Overlay Numbering plan area 414 1947 – – Milwaukee County and several outlying areas served by Milwaukee County exchanges. 608 1955 414 353/608 southwestern Wisconsin, including Madison. 353 2023 608 920 1997 414 274/920eastern Wisconsin including Green Bay, the Fox Cities, Manitowoc and Sheboygan. 274 2023 920262 1999 414 – Southeastern part of the state including Waukesha, Racine and Kenosha, except for Milwaukee County and several outlying areas served by Milwaukee County exchanges 715 1947 – 534/715 northern Wisconsin, including Superior, Eau Claire and Wausau 534 2010 715
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