>>1738354Mercer County is connected to Philadelphia by a light rail line (River Line) and multiple SEPTA commuter rail lines. Trenton is basically a twin city with Philadelphia. So Mercer definitely belongs with your "Delaware state" and with Ocean County NJ, well, beneath Toms River it is basically Philadelphia metro area, but people commute to NYC from this area, too.. so, it just gets messy on the fringe of any of these counties.
