Topic - Cook County

Cook County is a county in the United States state of Illinois, with its county seat in Chicago. It is the second most populous county in the US after Los Angeles County, California. The county has 5,231,351 residents, which is 40.6 percent of all Illinois residents. Cook County's population is larger than that of 29 individual U.S. states and the combined populations of the seven smallest states. There are over 130 incorporated municipalities in Cook County, the largest of which is Chicago, which makes up approximately 54% of the population of the county. That part of the county which lies outside of the Chicago city limits is divided into 30 townships. Geographically the county is the fifth largest in Illinois by land area and shares the state's Lake Michigan shoreline with Lake County. Including its lake area, the county has a total area of (42.16%) is water. Cook County's land is mainly urban and very densely populated. It is surrounded by the five collar counties. - Source: Wikipedia