A total of 1,000 acres were listed for sale in Somerset County, New Jersey, recently, representing a total value of almost $218 million in Somerset County farmsand rural real estate for sale. Somerset County ranks 10th in the state for the total number of acres of land currently advertised for sale. Of all locations in Somerset County with land for sale, Warren featured the most land for sale. Somerset County is the 14th biggest county (304 square miles) in New Jersey. It's located in the North New Jersey region of the state.