Sumter County is a county located in the west central portion of Alabama. At the 2020 census, the population was 12,345. Its county seat is Livingston. Its name is in honor of General Thomas Sumter of South Carolina. The University of West Alabama is in Livingston.

Thomas Sumter was an American military officer, planter, and politician who served in the Continental Army as a brigadier-general during the Revolutionary War. After the war, Sumter was elected to the House of Representatives and to the Senate, where he served from 1801 to 1810, when he retired. Sumter was nicknamed the "Fighting Gamecock" for his military tactics during the Revolutionary War.