Sumter County is in Pee Dee South Carolina. Of the 46 counties in the state, 682-square-mile Sumter County ranks 23rd by size. The most common type of land for sale by combined acreage in Sumter County is residential property. Browse all waterfront property for sale in Sumter County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits!