County Route 518 (New Jersey)

County Route 518 (CR 518) is a county highway in the U.S. state of New Jersey. It is designated entirely within Hunterdon County. The route runs for approximately 15.6 miles (25.1 km) from an intersection with Route 29 in Lambertville to an intersection with U.S. Route 206 in Montgomery Township, Somerset County, just over the county line.

CR 518 serves as a connector route between Lambertville and Montgomery Township, passing through Hopewell Township in Mercer County briefly. The route is primarily a two-lane road that traverses rural areas and small towns within Hunterdon County.

The road provides access to various points of interest, including historic sites, parks, and local businesses. It also intersects with several other county and state routes, facilitating travel throughout the region.

Maintaining CR 518 is the responsibility of the Hunterdon County Department of Public Works. Signage for the route is typically green with white lettering, consistent with other county routes in New Jersey. The route number is often displayed on signage alongside directional information.