Area code 414

North American telephone area code 414 is a state of Wisconsin area code which was created along with area code 715 as one of the two original area codes assigned to Wisconsin in October 1947. Currently, the 414 area code is nearly exclusive to Milwaukee County, including the city of Milwaukee. However, a few small portions of Muskego and Brookfield, in Waukesha County, along with the small industrial "Ambrosia triangle" which is a part of Milwaukee in southeast Washington County are also part of this area code.
The 414 area code originally covered most of the southern and northeastern portions of Wisconsin, with 715 covering the northwest. It was first split in 1955, when much of the western portion was split off as 608. This configuration remained in place until July 26, 1997, when the northern half became the 920 area code.
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