Resident Population in Jefferson County, AL was 662.89500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Jefferson County, AL reached a record high of 674.67500 in January of 2020 and a record low of 644.99100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Jefferson County, AL - last updated from the United States Federal Reserve on May of 2024.