SR 304 begins at a signalized intersection in downtown Girard at the junction of Churchhill Road and North State Street.

The area surrounding the intersection contains more commercial businesses and a cemetery but as SR 304 continues east, it reenters a mostly residential setting.

After traveling due east for about 4 miles (6.4 km), the route curves slightly to the east-southeast and crosses over I-80 without an interchange.

SR 304 continues due east on Liberty Street for about 0.6 miles (0.97 km) before curving northeast and straddling the Hubbard City–Township line.

[3] SR 304 was first designated in 1932 along the routing between US 422 in Girard and PA 318 at the Pennsylvania state line east of Hubbard that it follows today.