Flat Rock, OH

Flat Rock is a census-designated place in northeastern Thompson Township, Seneca County, Ohio, United States. The 2020 census counted 227 residents. Flat Rock was originally called Lewisville, and under the latter name was platted in 1841. A post office called Flat Rock has been in operation since 1846. In Flat Rock, history and present-day settings sit close enough to belong to the same local picture. The map tells the story in Flat Rock, where earlier chapters remain visible in current streets, buildings, and gathering places.