Ohio State Route 100

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.

State Route 100
Route information
Maintained by ODOT
Length	39.02 mi[1] (62.80 km)
Existed	1924–present
Major junctions
South end	SR 309 near Iberia
Major intersections	US 30 in Bucyrus US 224 in Tiffin
North end	SR 53 in Tiffin
Location
Country	United States
State	Ohio
Counties	Marion, Crawford, Seneca
Highway system
Ohio State Highway System Interstate US State Scenic
← SR 99 → SR 101

State Route 100 concurrent with State Routes 4 and 19 near Bucyrus

History

• 1924 – Original route established. Originally routed from 1-mile (1.6 km) north of Brokensword to Tiffin.^[2]
• 1939 - Extended to 12 miles (19 km) south of Bucyrus along route 19 from 1-mile (1.6 km) north of Brokensword to 3 miles (4.8 km) south of Bucyrus and an unnumbered road from 3 miles (4.8 km) south of Bucyrus to 12 miles (19 km) south of Bucyrus.^[2]

Major intersections

County	Location	mi	km	Destinations	Notes
Marion	Iberia	0.0	0.0	SR 309	Southern Terminus.
Crawford	Bucyrus	9.11	14.66	SR 19	Southern terminus of SR 19 concurrency; SR 19 continues south.
		12.53	20.17	SR 4 SR 98	Southern terminus of SR 4/SR 98 concurrency; SR 4/SR 98 continue south.
		12.67	20.39	SR 98	Northern terminus of SR 98 concurrency; SR 98 continues north.
		13.46	21.66	US 30	Full-access interchange with US 30.
		14.02	22.56	SR 4	Northern terminus of SR 4 concurrency; SR 4 continues north.
	Lykens Township	21.3	34.3	SR 19	Northern terminus of SR 19 concurrency; SR 19 continues north.
		25.12	40.43	SR 103	Eastern terminus of SR 103 concurrency; SR 103 continues east.
		25.26	40.65	SR 103	Western terminus of SR 103 concurrency; SR 103 continues west.
Seneca	Melmore	30.57	49.20	SR 67	Southern terminus of SR 67 concurrency; SR 67 continues south.
		30.83	49.62	SR 67	Northern terminus of SR 67 concurrency; SR 67 continues north.
	Tiffin	35.56	57.23	US 224
		37.88	60.96	SR 231	Southern terminus of SR 231 concurrency; SR 231 continues south.
		38.23	61.53	SR 231	Northern terminus of SR 231 concurrency; SR 231 ends.
		38.29	61.62	SR 18 SR 101
		39.02	62.80	SR 53	Northern terminus.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus