Resident Population in Jefferson County, TX was 251.49600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Jefferson County, TX reached a record high of 256.95900 in January of 1983 and a record low of 238.70000 in January of 1974. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Jefferson County, TX - last updated from the United States Federal Reserve on May of 2024.