Wis. Stat. § 104.001: Statewide concern; uniformity.

(1) The legislature finds that the provision of a minimum wage that is uniform throughout the state is a matter of statewide concern and that the enactment of a minimum wage ordinance by a city, village, town, or county would be logically inconsistent with, would defeat the purpose of, and would go against the spirit of this chapter. Therefore, this chapter shall be construed as an enactment of statewide concern for the purpose of providing a minimum wage that is uniform throughout the state.

(2) A city, village, town, or county may not enact and administer an ordinance establishing a minimum wage. Any city, village, town, or county minimum wage ordinance that is in effect on June 16, 2005, is void.