Located in Northeast Massachusetts, 846-square-mile Middlesex County is one of the ten biggest counties in the Bay State. The most common type of land for sale by combined acreage in Middlesex County is residential property. Browse all waterfront property for sale in Middlesex 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!