Resident Population in Warren County, MS was 42.29800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Warren County, MS reached a record high of 51.86100 in January of 1981 and a record low of 42.29800 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Warren County, MS - last updated from the United States Federal Reserve on May of 2024.