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). The total value of around 7,000 acres of residential land and property recently listed for sale in New Jersey's Union County was approximately $20 million. The average price of residential land 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.