Wis. Stat. § 66.0105: Jurisdiction of overlapping extraterritorial powers.

The extraterritorial powers granted to cities and villages by statute, including ss. 30.745, 62.23 (2) and (7a), 66.0415, 236.10 and 254.57, may not be exercised within the corporate limits of another city or village. Wherever these statutory extraterritorial powers overlap, the jurisdiction over the overlapping area shall be divided on a line all points of which are equidistant from the boundaries of each municipality concerned so that not more than one municipality shall exercise power over any area.