Hamilton 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 8,621 people, with a population density of about 19.82 persons per square mile.
The county spans a total land area of 435.00 square miles (1,127.00 square kilometers). The administrative center and county seat is McLeansboro, which often serves as a hub for local governance and services. The largest city within the county by population is McLeansboro.
Geographically, Hamilton County experiences varied elevations, with its highest point at Dahlgren 510 ft and its lowest point at McLeansboro 495 ft. The region operates in the UTC-6.