Of 67 counties in the Independence State, Armstrong County ranks 34th by size (663 square miles). Armstrong County is in Pittsburgh & Countryside Pennsylvania. Recent listings of riverfront homes and property for sale in Pennsylvania's Armstrong County totals almost 1,000 acres and a combined market value of $900,000. The most common type of land for sale by combined acreage in Armstrong County is residential property. 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 residential property.