Michigan's 40th House of Representatives district

Michigan's 40th House of Representatives district is a legislative district within the Michigan House of Representatives located in part of Kalamazoo County. 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
	Lenawee County Adrian Adrian Township Blissfield Township Clinton Township Deerfield Township Dover Township Fairfield Township Hudson Hudson Township Macon Township Madison Township Medina Township Morenci Ogden Township Palmyra Township Raisin Township Ridgeway Township Riga Township Rollin Township Rome Township Seneca Township Tecumseh Tecumseh Township Woodstock Township	1964 Apportionment Plan
	Lenawee County Excluding Rollin Township Hillsdale County Wright Township	1972 Apportionment Plan
	Lenawee County	1982 Apportionment Plan
	Oakland County Birmingham Bloomfield Hills Bloomfield Township Southfield Township Sylvan Lake	1992 Apportionment Plan
	Oakland County Birmingham Bloomfield Hills Bloomfield Township Keego Harbor Orchard Lake Village Southfield Township Sylvan Lake	2001 Apportionment Plan
	Oakland County Birmingham Bloomfield Township Bloomfield Hills West Bloomfield Township	2011 Apportionment Plan