State Routes in Ohio are owned by the state, and maintained by the state except in cities (see Numbered highways in Ohio). They are signed with a white silhouette of Ohio against a black background.
Markers Marker design in use from the early 1920s to 1926 Marker design in use from 1927 to 1948 Marker design in use from 1948 to 1961 Marker design in use from 1962 to 1966 Marker design in use from 1967 to 1970 Marker design used in Ohio since 1971Date ranges are approximate
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