Wisconsin's 40th Assembly district

The 40th Assembly District of Wisconsin is one of 99 districts in the Wisconsin State Assembly. Located in central Wisconsin, the district comprises parts of northern Columbia County and eastern and southern Sauk County. It includes the cities of Baraboo, Portage, Prairie du Sac, and Sauk City, and the villages of Merrimac, Pardeeville, Plain, Spring Green, and West Baraboo. The district also contains Devil's Lake State Park and Natural Bridge State Park. The district is represented by Republican Kevin D. Petersen, since January 2007.

The 40th Assembly district is located within Wisconsin's 14th Senate district, along with the 41st and 42nd Assembly districts.