Resident Population in Jefferson County, IN was 33.05600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Jefferson County, IN reached a record high of 33.11900 in January of 2021 and a record low of 27.00600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Jefferson County, IN - last updated from the United States Federal Reserve on May of 2024.