Kankakee is a city in Kankakee County, Illinois, in the United States. As of the 2000 census, the city population was 27,491. It is the county seat of Kankakee County. It is included in the Combined Statistical Area for Chicago. Library service is provided by the Kankakee Public Library. Kankakee apartments for rent comparison page shows most up to date rent information on Kankakee apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.