Of 16 counties in the state, Aroostook County is first in terms of its size (6,827 square miles). Aroostook County is in Northeast Maine. Recent Land Network data records nearly 1,000 acres of riverfront property for sale in Maine's Aroostook County, which is valued at a combined $298,000. Browse all waterfront property for sale in Aroostook 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 Aroostook County is house.