Union County is in North New Jersey. Of the 21 counties in the Garden State, Union County is 20th in terms of its size (67,513 acres). New Jersey's Union County includes nearly 2,000 acres of residential land for sale based on recent Land Network data. The combined market value of farms, rural land, hunting land and other land for sale here was nearly $15 million. The average price of residential acreage for sale in Union County was $1 million. Browse all residential land and rural property for sale in New Jersey to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.