Perintown, OhioPerintown is an unincorporated community in Clermont [County, Ohio|Clermont County], in the U.S. state of Ohio.HistoryA variant name was Perin's Mills. The community was named for Samuel Perin, who started a watermill at the site in 1813. A post office called Perins Mills was established in 1830, the name was changed to Perintown in 1890, and the post office closed in 1984.