| State Route 100 | ||||
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| Route information | ||||
| Maintained by ODOT | ||||
| Length: | 39.02 mi (62.80 km) | |||
| Existed: | 1924 – present | |||
| Major junctions | ||||
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| North end: |
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| Location | ||||
| Counties: | Marion, Crawford, Seneca | |||
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State Route 100 (SR 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.