Armstrong County is in Pittsburgh & Countryside Pennsylvania. Of the 67 counties in the state, Armstrong County ranks 34th in terms of size (663 square miles). There is approximately 1,000 acres of residential land and property for sale in Armstrong County, Pennsylvania, based on recent Land Network data. The combined market value of farms and rural land for sale here is around $13 million. The average price of residential land for sale in Armstrong County was $506,898. 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.