U.S. Federal Route 46 is an east-west highway in Northern Warren County. It runs from Interstate 80/New Jersey State Route 94, near Columbia, to the Morris/Warren County Line, near Netcong. U.S. Rt. 46 passes through the following towns in Warren County. Columbia Delaware Hackettstown U.S. Rt. 46 is not multi-plexed in Warren County. U.S. Rt. 46 intersects the following highways in Warren County. Interstate 80, at Columbia. New Jersey State Route 94, at Columbia. New Jersey State Route 163, at Columbia. New Jersey State Route 31, near Liberty. New Jersey State Route 182, at Hackettstown.