Cook 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 5,376,741 people, with a population density of about 683.66 persons per square mile.
The county spans a total land area of 946.00 square miles (2,450.00 square kilometers). The administrative center and county seat is Chicago, which often serves as a hub for local governance and services. The largest city within the county by population is Chicago.
Geographically, Cook County experiences varied elevations, with its highest point at South Barrington 858 ft and its lowest point at Crestwood 0 ft. The region operates in the UTC-6.