Of 67 counties in the state, Armstrong County is 34th in terms of its size (663 square miles). Armstrong County is in Pittsburgh & Countryside Pennsylvania. Armstrong County, Pennsylvania, has approximately 1,000 acres of ranches for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was almost $2 million. Browse all Armstrong County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Armstrong County is house.