Greene 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 14,761 people, with a population density of about 27.18 persons per square mile.
The county spans a total land area of 543.00 square miles (1,406.00 square kilometers). The administrative center and county seat is Carrollton, which often serves as a hub for local governance and services. The largest city within the county by population is White Hall.
Geographically, Greene County experiences varied elevations, with its highest point at Roodhouse 655 ft and its lowest point at Eldred 454 ft. The region operates in the UTC-6.