Clermont county is located in southwestern Ohio on the banks of the Ohio River with Batavia acting as the county seat. The county population on July 1, 1999, was 178,749, an increase of 28,655 over the 1990 census.
The county was the eighth of ten formed out of the southeast corner of the Northwest Territory by Gen. Arthur St. Clair, Territory Governor, in 1800, three years before Ohio became a state. The county's name is derived from the French word meaning "clear mountains and hills."
