Clark 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 144,742 people, with a population density of about 361.86 persons per square mile.
The county spans a total land area of 400.00 square miles (1,036.00 square kilometers). The administrative center and county seat is Springfield, which often serves as a hub for local governance and services. The largest city within the county by population is Springfield.
Geographically, Clark County experiences varied elevations, with its highest point at Catawba 1,237 ft and its lowest point at Northridge 0 ft. The region operates in the UTC-5.