The value of all farms and rural land for sale in Armstrong County, Pennsylvania, recently was nearly $12 million, representing a total of 1,104 acres of land for sale in Armstrong County. Armstrong County ranks 59th out of 67 counties in the state for the total acreage of land currently advertised for sale. Of all farms, rural land, hunting land and other land for sale in Armstrong County, Ford City featured the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Pennsylvania. Armstrong County is the 34th largest county (663 square miles) in Pennsylvania. It's located in the Pittsburgh & Countryside Pennsylvania region of Pennsylvania.