Summit County is in Northwest Colorado. Of the 64 counties in the Centennial State, 396,325-acre Summit County ranks 55th by size. The most common type of land for sale by combined acreage in Summit County is residential property. Browse all waterfront property for sale in Summit 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!