Leonardsville is a hamlet in the Town of Brookfield, Madison County, New York.
The book "Our country and its people; a descriptive and biographical record of Madison County, New York", gives the following account:
"The first merchant in Leonardsville and in this town was Reuben Leonard, from which family the village took its name; be began trading in 1801 and long conducted a large business for the time. he also kept a tavern in early years, managed a distillery, a tannery, and a large ashery; he was also the first postmaster. He failed about 1820."