The value of all farms, hunting land and other rural land and acreage for sale in Pennsylvania's Armstrong County recently was around $22 million, representing a combined 1,971 acres of land for sale in Armstrong County. Armstrong County ranks 51st out of 67 counties in the Keystone State for the combined amount of land currently advertised for sale. Of all locations in Armstrong County with farms, hunting land and other rural land and acreage for sale, Kittanning had the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Pennsylvania. Armstrong County is Pennsylvania's 34th largest county (663 square miles). It's located in the Pittsburgh & Countryside Pennsylvania region of the state.