State Route 304 (SR 304) is an east–west state highway in the northeastern portion of Ohio, a U.S. state. The western terminus of SR 304 is at a signalized intersection with US 422 in Girard. Its eastern terminus is at the Pennsylvania State Line nearly 3 miles (4.8 km) east of Hubbard, where the highway continues east as Pennsylvania Route 318.Created in the early 1930s, SR 304 traverses the northern suburban portions of the Youngstown area.