In 1950, State Route 18's eastern terminus was moved to Youngstown.

SR 18 was realigned around North Baltimore on a two-lane 2.2-mile-long (3.5 km) bypass completed in 2012.

[2] The new bypass, which included a roundabout at the eastern transition to the original route, was built to facilitate traffic to a new CSX rail yard in Henry Township.

is a 1.9-mile-long (3.1 km) business route through the village of North Baltimore in southern Wood County.

The route starts at a T-intersection with SR 18 in Henry Township and runs east into North Baltimore on Deshler Road and West State Street.

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