Resident Population in Kankakee County, IL was 106.41000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Kankakee County, IL reached a record high of 113.53200 in January of 2011 and a record low of 95.48100 in January of 1988. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Kankakee County, IL - last updated from the United States Federal Reserve on April of 2026.