Of 67 counties in the state, Allegheny County ranks 30th by size (744 square miles). Allegheny County is in Pittsburgh & Countryside Pennsylvania. Recent listings of riverfront land for sale in Pennsylvania's Allegheny County totals nearly 1,000 acres and a combined market value of approximately $100,000. The most common type of land for sale by combined acreage in Allegheny County is residential property. Browse all waterfront property for sale in Allegheny 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 Allegheny County is residential property.