Cook County, Illinois

Cook County is a county in the U.S. state of Illinois. It is the second most populous county in the United States after Los Angeles County. According to 2008 US Census Bureau estimates, the county has 5,294,664 residents, which is larger than the populations of 29 individual U.S. states, the combined populations of the seven smallest US states, and home to 43.3% of Illinois residents. There are over 130 incorporated municipalities in Cook County, the largest of which is the county seat, Chicago, which makes up approximately 54% of the population of the county. The county is divided into thirty different townships. Geographically the county is the fifth largest in Illinois by land area and shares the state's coast line on Lake Michigan with Lake County.