Resident Population in Marion County, MS was 24.22400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Marion County, MS reached a record high of 26.98700 in January of 2010 and a record low of 22.87100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Marion County, MS - last updated from the United States Federal Reserve on May of 2024.