Resident Population in Monroe County, MO was 8.69800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Monroe County, MO reached a record high of 9.90000 in January of 1975 and a record low of 8.59400 in January of 2017. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Monroe County, MO - last updated from the United States Federal Reserve on May of 2024.