NULL Of 254 counties in the state, Armstrong County ranks 140th in terms of size (913 square miles). Armstrong County is in Panhandle Texas. A recent survey of Land Network data records 10,000 acres of recreational land for sale in Texas's Armstrong County, which is valued at a combined $17 million. Browse all recreational property for sale in Armstrong County to find the recreational tract that suits your lifestyle needs, from hunting and fishing properties for the outdoor enthusiast to undeveloped acreage ready for future residential-property development. The most common type of land for sale by combined acreage in Armstrong County is farms.