Michigan's 20th Senate district is one of 38 districts in the Michigan Senate.

The 20th district was created by the 1850 Michigan Constitution, as the 1835 constitution only permitted a maximum of eight senate districts.

[2][3] It has been represented by Republican Aric Nesbitt since 2023, succeeding Democrat Sean McCann.

[4][5] District 20 encompasses parts of Allegan, Berrien, Kent, and Van Buren counties.

[6] District 20, as dictated by the 2011 Apportionment Plan, was exactly coterminous with Kalamazoo County, including the city of Kalamazoo and the surrounding communities of Portage, Comstock Northwest, Eastwood, Westwood, Vicksburg, Kalamazoo Township, Oshtemo Township, Texas Township, Comstock Township, and Cooper Township.