Ohio State Route 100

State Route 100 is a north-south highway in northwestern Ohio. Its southern terminus is at State Route 309 near Iberia, and its northern terminus is at State Route 53 in Tiffin.

History

Established in 1924, the original routing was from north of Brokensword to Tiffin. In 1939, it was extended to south of Bucyrus along route 19 from north of Brokensword to south of Bucyrus and an unnumbered road from south of Bucyrus to south of Bucyrus.