Resident Population in Jefferson County, MS was 6.94100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Jefferson County, MS reached a record high of 9.68600 in January of 2000 and a record low of 6.94100 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Jefferson County, MS - last updated from the United States Federal Reserve on May of 2024.