Located in Tallgrass Prairie Kansas, 1,184-square-mile Sumner County is one of the ten biggest counties in the Wheat State. The most common type of land for sale by combined acreage in Sumner County is house. Browse all waterfront property for sale in Sumner 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!