Clinton County is a county located in the U.S. state of Ohio. As of the most recent data available, the county has a population of approximately 40,543 people, with a population density of about 98.64 persons per square mile.
The county spans a total land area of 411.00 square miles (1,064.00 square kilometers). The administrative center and county seat is Wilmington, which often serves as a hub for local governance and services. The largest city within the county by population is Wilmington.
Geographically, Clinton County experiences varied elevations, with its highest point at New Vienna 1,119 ft and its lowest point at Clarksville 0 ft. The region operates in the UTC-5.