Clinton County is a county located in the U.S. state of Illinois. As of the most recent data available, the county has a population of approximately 35,535 people, with a population density of about 74.97 persons per square mile.
The county spans a total land area of 474.00 square miles (1,228.00 square kilometers). The administrative center and county seat is Carlyle, which often serves as a hub for local governance and services. The largest city within the county by population is Breese.
Geographically, Clinton County experiences varied elevations, with its highest point at Wamac 500 ft and its lowest point at Damiansville 430 ft. The region operates in the UTC-6.