Land for sale in Clinton County, Pennsylvania, recently totaled nearly $9 million and approximately 1,000 acres. Clinton County ranks 60th in the Independence State for the combined amount of land currently advertised for sale. Mill Hall had the most land for sale. Manufacturing and related services are the largest economic sectors in Clinton County. Clinton County is Pennsylvania's 17th largest county (896 square miles). It's located in the Great Lakes & Wilds Pennsylvania region of the state.