The western terminus of State Route 508 is at a signalized intersection with State Route 235 in the village of De Graff.

The entirety of State Route 508 is located within Logan County.

This highway is not incorporated within the National Highway System, a network of highways that are vital to the economy, defense and mobility of the country.

[2] First appearing in 1937, State Route 508 occupies the same exact De Graff-to-West Liberty routing today that it did when it was assigned.

[3][4] The entire route is in Logan County.