Resident Population in Monroe County, IN was 140.70200 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Monroe County, IN reached a record high of 148.17800 in January of 2019 and a record low of 85.22100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Monroe County, IN - last updated from the United States Federal Reserve on April of 2026.