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Flat Rock, Ohio facts for kids

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Flat Rock
census-designated place
Country United States
State Ohio
County Seneca
Township Thompson
Time zone Eastern (EST) (UTC-5)
 • Summer (DST) EDT (UTC-4)
ZIP codes 44828

Flat Rock is a census-designated place in northeastern Thompson Township, Seneca County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 44828.


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. The present name comes from a flat layer of rock covering an artesian aquifer.

Place of interest

  • Seneca Caverns
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