There was a combined nearly $183 million of farmsand rural real estate for sale in New Jersey's Mercer County recently on Land.com. The total acreage of all Mercer County farms, rural land, hunting land and other land for sale was approximately 1,000 acres. Mercer County ranks 15th in New Jersey for the total acreage of land currently advertised for sale. Among cities in Mercer County with farms, hunting land and other rural land and acreage for sale, Princeton featured the most land for sale. From an economic perspective, government and state-level services contribute most to Mercer County's overall GDP. Mercer County is the 16th largest county (228 square miles) in New Jersey. It's located in the Central New Jersey region of the state.