Of 10 counties in the state, Rockingham County ranks sixth by size (795 square miles). Rockingham County is in South New Hampshire. New Hampshire's Rockingham County includes almost 1,000 acres of lakefront land and property for sale based on recent Land Network data. The combined market value of farms, rural land, hunting land and other land for sale here was approximately $2 million. Browse all waterfront property for sale in Rockingham 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! The most common type of land for sale by combined acreage in Rockingham County is house.