Resident Population in Warren County, IN was 8.51800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Warren County, IN reached a record high of 9.01300 in January of 1981 and a record low of 8.14900 in January of 1991. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Warren County, IN - last updated from the United States Federal Reserve on May of 2024.