Resident Population in Knox County, IN was 36.07000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Knox County, IN reached a record high of 42.45300 in January of 1981 and a record low of 35.78900 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Knox County, IN - last updated from the United States Federal Reserve on May of 2024.