Of 67 counties in the Keystone State, Allegheny County is 30th in terms of its size (744 square miles). Allegheny County is in Pittsburgh & Countryside Pennsylvania. There is nearly 1,000 acres of riverfront property for sale in Pennsylvania's Allegheny County based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here is almost $100,000. 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.