Alexander 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 9,590 people, with a population density of about 40.64 persons per square mile.
The county spans a total land area of 236.00 square miles (611.00 square kilometers). The administrative center and county seat is Cairo, which often serves as a hub for local governance and services. The largest city within the county by population is Cairo.
Geographically, Alexander County experiences varied elevations, with its highest point at Thebes 413 ft and its lowest point at Cairo 311 ft. The region operates in the UTC-6.