Blair County is in Alleghenies & Valleys Pennsylvania. Of the 67 counties in the Independence State, 527-square-mile Blair County ranks 44th by size. The most common type of land for sale by combined acreage in Blair County is house. Browse all waterfront property for sale in Blair 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!