Mercer County, New Jersey, County Highway 672 is a county highway in Mercer County, New Jersey, United States. It is Church Street and South Broad Street in Hamilton Township, Mercer County, New Jersey from a bridge into Burlington County, New Jersey in the North Crosswicks/Woodwardsville area (where it continues on as Burlington County, New Jersey, County Highway 660) to an intersection with New Jersey Secondary Highway 524 in the Yardville area of Hamilton Township.