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.