Of 67 counties in the Keystone State, Armstrong County ranks 34th by size (663 square miles). Armstrong County is in Pittsburgh & Countryside Pennsylvania. There is nearly 1,000 acres of riverfront land and property for sale in Pennsylvania's Armstrong County based on recent Land Network data. The combined market value of land and rural real estate for sale here is approximately $900,000. Browse all waterfront property for sale in Armstrong County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Armstrong County is house.