Area codes 608 and 353

[2] Rapid growth of the area, specifically in Dane County, brought the area code close to exhaustion of central office prefixes, with NANPA projections in 2022 projecting the need for relief by late 2023.

[3] In September 2022, the Wisconsin Public Service Commission and North American Numbering Plan Administrator (NANPA) announced an overlay complex for the numbering plan area with new area code 353, with an in-service date of September 15, 2023.

The counties served by the area codes are Adams, Buffalo, Columbia, Crawford, Dane, Grant, Green, Iowa, Jackson, Juneau, La Crosse, Lafayette, Marquette, Monroe, Richland, Rock, Sauk, Trempealeau, and Vernon.

Cities in the numbering plan area are Madison, Waunakee, Mount Horeb, Verona, Sun Prairie, Monroe, Platteville, Lancaster, Lodi, Portage, Baraboo, Wisconsin Dells, Beloit, Janesville, La Crosse, Prairie du Chien, Prairie du Sac, Sauk City, Viroqua, and Sparta.

This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.