Sullivan County is in Northeast Mountains Pennsylvania. Of the 67 counties in the Independence State, 289,596-acre Sullivan County ranks 50th by size. Recent listings of residential land for sale in Pennsylvania's Sullivan County totals about 1,000 acres and a combined market value of $6 million. The most common type of land for sale by combined acreage in Sullivan County is residential property. The average price of residential acreage for sale in Sullivan County was $333,155. Browse all residential land and rural property for sale in Pennsylvania 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.