Michigan's 31st House of Representatives district
Michigan's 31st House of Representatives district is a legislative district within the Michigan House of Representatives located in parts of Lenawee, Monroe, Washtenaw, and Wayne counties. The district was created in 1965, when the Michigan House of Representatives district naming scheme changed from a county-based system to a numerical one.
Historical district boundaries
| Map | Description | Apportionment Plan | Notes |
| Wayne County | 1964 Apportionment Plan | ||
| Wayne County | 1972 Apportionment Plan | ||
| Wayne County | 1982 Apportionment Plan | ||
| Macomb County | 1992 Apportionment Plan | ||
| Macomb County | 2001 Apportionment Plan | ||
| Macomb County | 2011 Apportionment Plan |