Land for sale in Salem County recently totaled nearly $59 million and almost 2,000 acres. Salem County ranks 13th out of 21 counties in New Jersey for the combined amount of land currently advertised for sale. Of all land and rural real estate for sale in Salem County, Pennsville featured the most land for sale. Salem County is one of the ten largest counties in New Jersey (372 square miles). It's located in the Central New Jersey region of New Jersey.