Land for sale in Sullivan County recently totaled approximately $10 million and 2,000 acres. Sullivan County ranks 60th out of 67 counties in the Keystone State for the combined amount of land currently advertised for sale. Of all land for sale in Sullivan County, Dushore featured the most land for sale. Based on its natural assets, Sullivan County's economy is dependent on tourism and recreation. Sullivan County is Pennsylvania's 50th biggest county (452 square miles). It's located in the Northeast Mountains Pennsylvania region of Pennsylvania.