Of 10 counties in the state, Coos County ranks first in terms of size (1,830 square miles). Coos County is in the North New Hampshire region. The most common type of land for sale by combined acreage in Coos County is undeveloped land. 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!