Wisconsin's 16th Senate district

Wisconsin's 16th
State Senate district

2024 map defined in 2023 Wisc. Act 94
2022 map defined in Johnson v. Wisconsin Elections Commission
2011 map was defined in 2011 Wisc. Act 43
composed of Assembly districts 46, 47, and 48
Senator
  Melissa Ratcliff
DCottage Grove
since January 6, 2025 (162 days)
Demographics83.03% White
5.02% Black
6.31% Hispanic
3.85% Asian
1.51% Native American
0.11% Hawaiian/Pacific Islander
Population (2020)
  Voting age
177,313
137,206
WebsiteOfficial website
NotesSouth-central Wisconsin

The 16th Senate district of Wisconsin is one of 33 districts in the Wisconsin Senate. Located in south-central Wisconsin, the district comprises much of eastern Dane County, western Jefferson County, and part of southwest Dodge County. It includes the cities of Fitchburg, Fort Atkinson, Lake Mills, Stoughton, Sun Prairie, and Waterloo, and the villages of Cottage Grove, Deerfield, and Marshall, and parts of the city of Madison and the village of McFarland. It also contains Lake Kegonsa State Park and most of Lake Koshkonong.