Ohio State Route 603

State Route 603 (SR 603) is a north–south state highway in the northern portion of the U.S. state of Ohio. Its southern terminus is at State Route 95 near Perrysville, and its northern terminus is at State Routes 61 and 98 in Plymouth along the Baseline Road that separates Huron County and Richland County, and subsequently the southern boundary of the Firelands and Connecticut Western Reserve.

State Route 603
Route information
Maintained by ODOT
Length	33.58 mi[1] (54.04 km)
Existed	1938[2][3]–present
Major junctions
South end	SR 95 near Perrysville
Major intersections	SR 430 near Mifflin US 30 near Mifflin US 42 near Ashland
North end	SR 61 / SR 98 in Plymouth
Location
Country	United States
State	Ohio
Counties	Richland, Ashland
Highway system
Ohio State Highway System Interstate US State Scenic
← SR 602 → SR 604

The Silas Ferrell House, a historic site on State Route 603 at Shiloh

History

SR 603 was commissioned in 1938 along its current alignment, between Shiloh and SR 95.^[2][3] Between 1953 and 1955 the route was paved.^[4][5] The route was extended west to Plymouth between 1959 and 1961.^[6][7]

Major intersections

County	Location	mi[1]	km	Destinations	Notes
Richland	Monroe Township	0.00	0.00	SR 95 – Perrysville, Butler
		4.72	7.60	SR 39 – Perrysville, Lucas
Ashland	Mifflin Township	9.98	16.06	SR 430 west	Eastern terminus of SR 430
		10.60	17.06	US 30 – Mansfield, Wooster
Richland	No major junctions
Ashland	Milton Township	13.63	21.94	US 42 – Mansfield, Ashland
Richland	Weller Township	18.71	30.11	SR 545 (North Olivesburg Road) – Mansfield, Savannah
		19.09	30.72	SR 96 – Shelby, Ashland
	Blooming Grove Township	23.11	37.19	SR 13 – Mansfield, Norwalk
Richland–Huron county line	Plymouth	33.58	54.04	SR 61 / SR 98 (Plymouth Street / Sandusky Street) / West Broadway Street
1.000 mi = 1.609 km; 1.000 km = 0.621 mi