New Jersey State Route 173 runs briefly in Southern Warren County. It runs from Interstate 78/U.S. Rt. 22/New Jersey State Route 122, at Phillipsburg to the Warren/Hunterdon, near Bloomsbury. NJ St Rt 173 does not pass through the following towns in Warren County. NJ St Rt 173 is not multi-plexed in Warren County. NJ St Rt 173 intersects the following highways in Warren County. Interstate 78, at Phillipsburg. U.S. Rt. 22, at Phillipsburg. New Jersey State Route 122, at Phillipsburg.
