[1][2][3] SR 570 was a state-maintained section of Neowash Road in southern Lucas County.

The four-mile-long (6.4 km) route connected SR 295 in Providence Township and US 24 southwest of Waterville.

[2][4] The road itself is still a state highway as SR 576 was signed on the entire route after being extended from Montpelier.

When it was created in 1937, the route extended from SR 570 near Bailey and ended at US 20 (Central Avenue) near Silica.

[9] SR 573 was the designation for Mekus Road in northeastern Defiance County from 1939 until 1945.

[4] At the time, US 24 crossed to the north side of the Maumee River at the Grand Rapids bridge.

[12] However, by 1945, the entire route only consisted of the bridge and its approaches, the alignment it would use for nearly the next seven decades.

[7][8] The route started in the Richland Township community of Independence near the banks of the Maumee River at US 24 to US 6 in Ridgeville Corners.

[19] SR 581 was a 15-mile-long (24 km) state highway in the eastern portion of Lucas County.

[4][8] SR 584 was a short state route in southern Ottawa County.

Starting at SR 19 in Salem Township, south of Oak Harbor and the Portage River, the route traveled east along West Oak Harbor-Southeast Road for about eight miles (13 km) before ending at SR 53 in Bay Township at the Sandusky Bay.

[23] SR 585 was the designation for the road that currently carries US 20 from the community of Kipton to east of Oberlin.

Created in 1937, it existed for about two years until it was fully replaced by US 20; SR 10 was then extended over the former routing of US 20 through Kipton and Oberlin.

The route existed from 1937 until 1955 and traveled from Springville at US 23, passed through New Riegel, and ended west of Tiffin at US 224.

[2][4] Today, all of the former route retains its old number as Seneca County Road 591.

[25] SR 596 was a state route that ran around the northeastern shore of Buckeye Lake entirely in Licking County.

[29][30] The route's southern terminus had always been at the West Virginia state line on the East Huntington Bridge.

[30] SR 612 was the designation for a state-maintained section of West 130th Street in Cuyahoga County.

The route traveled due north through several small communities in eastern Portage County.

The route started at SR 45 in Jackson Township and traveled east along Kirk Road.

[4][38] When it was created in 1937, the route ran on Valley View Road from the Cuyahoga/Summit County line on the northern border of Sagamore Hills and traveled southeast through Northfield and Macedonia before ending at SR 91 just north of Hudson.

[40] SR 636 was a ten-mile-long (16 km) state highway in western Van Wert County.

[41] SR 655 was a seven-mile-long (11 km) state highway entirely in Mead Township, Belmont County.

[4][43] In the next year, the entire route merged with SR 669, the number the road continues to carry today.