Of 67 counties in the Keystone State, Mercer County is 33rd in terms of its size (682 square miles). Mercer County is in Great Lakes & Wilds Pennsylvania. A recent survey of Land Network data records 1,000 acres of lakefront homes and property for sale in Pennsylvania's Mercer County, which is valued at a combined $300,000. Browse all waterfront property for sale in Mercer 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 Mercer County is residential property.