Mercer County is located in the center of NJ and borders Pennsylvania on the left. Mercer County boasts Trenton, the capitol of NJ, as it’s county seat. Washington Crossing State Park, Old Barracks Museum and Princeton Battlefield State Park are important part of our country’s history and are located in Mercer County. Other “must visit” attractions are Grounds for Sculpture, Morven Gardens and Princeton University Art Museum. Most of all, rent an apartment in Mercer County and see why our residents love it here!