Ohio State Route 304 is a ten-mile east-west route on the north side of the Youngstown area. Interstate 80 and Ohio Route 304 are always within a couple miles of each other, for as long as Ohio Route 304 runs. The western end of Ohio Route 304 is in Girard, at US Route 422. From there, Ohio Route 304 goes east for ten miles to the Pennsylvania border, where it becomes Pennsylvania Highway 318.