Of 21 counties in the Garden State, Warren County ranks 11th in terms of size (362 square miles). Warren County is in North New Jersey. Warren County, New Jersey, includes roughly 1,000 acres of lakefront property for sale based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here was around $600,000. Browse all waterfront property for sale in Warren 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 Warren County is house.