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 | |