Franklin 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 39,018 people, with a population density of about 94.70 persons per square mile.
The county spans a total land area of 412.00 square miles (1,067.00 square kilometers). The administrative center and county seat is Benton, which often serves as a hub for local governance and services. The largest city within the county by population is West Frankfort.
Geographically, Franklin County experiences varied elevations, with its highest point at Thompsonville 507 ft and its lowest point at Royalton 391 ft. The region operates in the UTC-6.