Armstrong County is in Pittsburgh & Countryside Pennsylvania. Of the 67 counties in the Keystone State, Armstrong County is 34th in terms of its size (663 square miles). Recent listings of farms for sale in Armstrong County, Pennsylvania, totals nearly 1,000 acres and a combined market value of about $3 million. The most common type of land for sale by combined acreage in Armstrong County is house. The average price of farmland for sale in Armstrong County was $559,983. Farms for sale in Armstrong County support livestock including horses, cattle, sheep, pig and goats. Browse all Pennsylvania farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or individual needs.