Of 10 counties in the state, 1 million-acre Coos County ranks first by size. Coos County is in the North New Hampshire region. The most common type of land for sale by combined acreage in Coos County is residential property. Browse all waterfront property for sale in Coos 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!