Michigan's 99th House of Representatives district
Michigan's 99th House of Representatives district is a legislative district within the Michigan House of Representatives located in parts of Bay, Clare, and Gladwin counties, as well as all of the Arenac, Iosco, and Ogemaw 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. The district lines were redrawn to now consist of Iosco, Ogemaw and Arenac counties in their entirety and portions of Bay, Clare and Gladwin counties.
Historical district boundaries
| Map | Description | Apportionment Plan | Notes |
| 1964 Apportionment Plan | |||
| 1972 Apportionment Plan | |||
| Isabella CountyMecosta County | 1982 Apportionment Plan | ||
| Clare County Isabella County | 1992 Apportionment Plan | ||
| Isabella County Midland County | 2001 Apportionment Plan | ||
| Isabella CountyMidland County | 2011 Apportionment Plan |