CR 519 begins at an intersection with Route 29 in Delaware Township, Hunterdon County, heading north on two-lane, undivided Kingwood-Stockton 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.

It passes near a mix of farm fields and residential neighborhoods as it makes a curve to the north and crosses into Lopatcong Township.

CR 519 briefly becomes a divided highway as it passes under Norfolk Southern's Washington Secondary before crossing Route 57.

[1][2] Past this intersection, the route enters more rural areas of farms and woods with a few homes and businesses as it continues into Harmony Township.

[1][2] From this point, CR 519 becomes Bridgeville-Hope Road and passes through more farm areas immediately to the west of Jenny Jump State Forest, turning more to the northeast and entering Hope Township.

CR 519 continues northeast out of Hope along Hope-Johnsonburg Road, passing through a mix of farmland and woodland with occasional homes.

Route 94 and CR 519 continue to downtown Newton and come to the Park Place square, where the road meets US 206.

At this point, all three routes run concurrent north on four-lane undivided Water Street for a short distance.

[1][2] The route crosses into Hampton Township and becomes Conrads Corner Road as it passes rural areas of residences, heading northeast.

The road passes a mix of residences and businesses as it reaches the center of Branchville, where CR 519 turns northeast onto Wantage Avenue.

The route makes a turn north onto Branchville-Lewisburg Road, with Wantage Avenue continuing to the northeast as CR 629.

[1][2] Upon crossing into Wantage Township, the road makes a turn to the east and passes a mix of homes and businesses as well as the Space Farms Zoo and Museum.

This road carries the route north, entering dense forests and crossing the Appalachian Trail before it comes to the New York border.