Of 21 counties in the Garden State, Warren County is 11th in terms of its size (362 square miles). Warren County is in North New Jersey. New Jersey's Warren County has roughly 1,000 acres of farms 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 about $1 million. Browse all Warren County farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future commercial or lifestyle needs. The most common type of land for sale by combined acreage in Warren County is house.