Union County is in North New Jersey. Of the 21 counties in the Garden State, 105-square-mile Union County ranks 20th by size. Recent listings of undeveloped land for sale in Union County, New Jersey, totals almost 1,000 acres and a combined market value of around $10 million. The most common type of land for sale by combined acreage in Union County is house. The average price of undeveloped acreage for sale in Union County was $3 million. Some suggested uses for undeveloped land currently for sale in Union County include for commercial, hunting/fishing, and orchard use. Current commercial applications for commercial property for sale in Union County include for commercial, hunting/fishing and orchard use. Browse all New Jersey undeveloped acreage for sale on the Land Network to find your next commercial property or land investment.