Resident Population in Kendall County, IL was 139.97600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Kendall County, IL reached a record high of 139.97600 in January of 2023 and a record low of 26.37400 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Kendall County, IL - last updated from the United States Federal Reserve on May of 2024.