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Cook County is a county in the US state of Illinois, with its county seat in Chicago.

It is the second most populous county in the US after Los Angeles County.

The county has 5, 217, 080 residents, which is 40. 5 percent of all Illinois residents.

Cook County's population is larger than that of 29 individual US 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.

Cook County is mainly urban and very densely populated, containing the city of Chicago and many suburbs.