Resident Population in Lamar County, GA was 20.40100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Lamar County, GA reached a record high of 20.40100 in January of 2023 and a record low of 10.68800 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Lamar County, GA - last updated from the United States Federal Reserve on May of 2024.