Armstrong County is in Pittsburgh & Countryside Pennsylvania. Of the 67 counties in the state, 663-square-mile Armstrong County ranks 34th by size. Recent listings of farms for sale in Armstrong County, Pennsylvania, totals around 1,000 acres and a combined market value of $4 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 $436,737. Farms for sale in Armstrong County support livestock including horses, cattle, pig, sheep 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 lifestyle needs.