Sumter /ˈsʌmtər/ is the county seat of Sumter County, South Carolina, United States. Known as the Sumter Metropolitan Statistical Area, the namesake county adjoins Clarendon and Lee to form the core of Sumter-Lee-Clarendon tri-county area of South Carolina, an area that includes the three counties in the east central Piedmont. The U.S. Census Bureau estimated the city's population was 39,643 at the 2000 census. The 2010 census puts the city at 40,524.

Incorporated as Sumterville in 1845, the city's name was shortened to Sumter in 1855. It has grown and prospered from its early beginnings as a plantation settlement. The city and county of Sumter bear the name of General Thomas Sumter, the "Fighting Gamecock" of the American Revolutionary War.

During the Civil War the town was an important supply and railroad repair center for the Confederacy. After the war, Sumter grew and prospered, using its large railroad network to supply cotton, timber, and by the start of the 20th century, tobacco to the region.

During the 20th century, Sumter grew into a major industrial center. Starting with the opening of Shaw Air Force Base (now home to the 9th Air Force, 20th Fighter Wing, and United States Army Central) in 1941, industry grew, especially after World War II. Sumter became increasingly known for textiles, manufacturing, biotech industries, a thriving retail environment and medical center of its region in addition to agricultural products, which makes it a hub for business in the east central portion of South Carolina.

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