Resident Population in Sumter County, AL was 11.60700 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Sumter County, AL reached a record high of 17.30000 in January of 1978 and a record low of 11.60700 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Sumter County, AL - last updated from the United States Federal Reserve on April of 2026.