U.S. Federal Route 136 runs east-west across Central Atchison County. This is the western most county that this highway passes through in Missouri. U.S. Rt. 136 passes through the following towns in Atchison County. Tarkio Rock Port U.S. Rt. 136 is multi-plexed in Atchison County. U.S. Rt. 59, near Tariko. U.S. Rt. 136 intersects the following highways in Atchison County. Missouri Secondary State Route YY, near Elmo. Missouri Secondary State Route M, near Westboro. Missouri Secondary State Route N, near westboro. Missouri Secondary State Route O, near Tarkio. U.S. Rt. 59, near Tarkio.U.S. Rt. 59, near Tarkio. Missouri Secondary State Route J, near Rock Port. Missouri Secondary State Route Y, near Rock Port. Missouri State Route 111, at Rock Port. U.S. Rt. 275, near Rockport. Interstate 29, near Rock Port. Missouri Secondary State Route U, near Phelps City. Missouri Secondary State Route D, near Phelps City.
