[1] Located in east-central Wisconsin, the district comprises most of the northern half of Dodge County and part of southern Fond du Lac County.

It includes the cities of Beaver Dam, Fox Lake, Mayville, and Waupun, and the villages of Brownsville, Lomira, Oakfield, and Randolph.

The district also contains the Horicon Marsh State Wildlife Area.

[2] The district is represented by Republican Mark Born, since January 2025; Born previously represented the 39th district from 2013 to 2025.

This article about a location in the state of Wisconsin is a stub.