Thornville is an unincorporated community at 42°56'33?N 83°13'26?W on the boundary between Metamora Township on the west and Dryden Township on the east. It was given a post office with the name "Amboy" on March 21, 1837, with Joseph S. Gibbins as the first postmaster. Benjamin Thorne, who came here from Dutchess County, New York in 1839, became the third postmaster on December 3, 1845. On July 14, 1854, the settlement and post office were renamed Thornville after him. The post office operated until June 30, 1905. [Wikipedia]