Of 67 counties in the Independence State, Mercer County ranks 33rd by size (682 square miles). Mercer County is in Great Lakes & Wilds Pennsylvania. Recent listings of ranches for sale in Mercer County, Pennsylvania, totals roughly 1,000 acres and a combined market value of $1 million. The most common type of land for sale by combined acreage in Mercer County is residential property. Browse all Mercer County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Mercer County is residential property.