Of 67 counties in the Keystone State, Mercer County ranks 33rd by size (682 square miles). Mercer County is in Great Lakes & Wilds Pennsylvania. There is 1,000 acres of lakefront homes and property for sale in Mercer County, Pennsylvania, based on recent Land Network data. The combined market value of farms and rural land for sale here is $400,000. 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.