County Route 519 (CR 519) is a county highway in the U.S. state of New Jersey. The highway extends from Daniel Bray Highway (Route 29) in Delaware Township to the New York state line in Wantage Township. It is the state's longest county route. Route description CR 519 begins at an intersection with Route 29 in Delaware Township, Hunterdon County, heading north on two-lane, undivided Kingwood-Stockton Road. The road first passes through woods before entering farm fields. The route passes through the residential community of Rosemont before continuing back into agricultural areas. CR 519 enters Kingwood Township and continues through a mix of farmland and woodland, becoming Kingwood Road at the CR 651 intersection. In Kingwood Township, the route comes to a junction with Route 12 in the community of Baptistown, where the road is lined with homes. CR 519 passes through more rural areas with a few housing developments as it continues into Alexandria Township. Here, the route turns northwest onto Palmyra Road at an intersection with Senator Stout Road/Hog Hollow Road and soon crosses CR 513. CR 519 forms the border between Holland Township to the west and Alexandria Township to the east as turns southwest onto Mount Pleasant Road, with CR 631 continuing north. At this point, the route is fully within Holland Township and continues through agricultural areas before entering Milford. The road makes a turn to the south before heading southwest again and passes residences. At the intersection with CR 619, CR 519 turns northwest onto Frenchtown Road and becomes Water Street at the intersection with Bridge Street/Barron Road a short distance later in the commercial center of Milford. The road passes more homes before leaving Milford for Holland Township again and becoming Milford-Warren Glen Road. In this area, the route passes a mix of farms, woods, and residential subdivisions, turning north and running through the community of Riegel Ridge. Past here, CR 519 enters woodland and turns northwest before crossing over Musconetcong Mountain. After crossing the Musconetcong River, CR 519 enters Pohatcong Township, Warren County and immediately turns north at the CR 627 intersection into wooded areas with some farms and homes. The route winds to the northwest and passes under I-78. After this, CR 519 becomes Springtown Road and briefly forms the border between Alpha to the west and Pohatcong Township to the east before completely entering Alpha and continuing north. The road