  middletown is an unincorporated community in caledonia township of shiawassee county in the u.s. state of michigan, located along m-71/corunna avenue between the cities of corunna and owosso. it is a census-designated place (cdp) for statistical purposes and has no legal status as an incorporated municipality. the population was 966 at the 2000 census. ==geography== acco
Census-designated_places_in_Michigan Unincorporated_communities_in_Michigan