Route 122 is a short, 2.42-mile (3.89 km) long state highway in Warren County, New Jersey. The route runs from Warren County Route 678 and Pursel Street in Phillipsburg to an intersection with U.S. Route 22 in Pohatcong Township. The route is a former alignment of U.S. Route 22, designated in 1926. The route became U.S. Route 22 Alternate until 1993, when the route was decommissioned and replaced by County Route 678 and Route 122.