Crestline is a village in Crawford and Richland Counties in the U.S. state of Ohio. Crestline’s population was 4,630 at the 2010 census. It is the third largest municipality in Crawford County. The Crawford County allocation of Crestline is portion of the Bucyrus Micropolitan Statistical Area, while the small portion of the village that extends into Richland County is considered allowance of the Mansfield Metropolitan Statistical Area.

First came the railroad, and next came the town. It all started in 1850 gone a route was needed in the middle of Shelby and Galion, a distance of 13 miles, by the Cleveland, Columbus and Cincinnati Railroad, or the “Bee Line” as it was known then. Since there was no town amid Shelby and Galion, it was contracted that a station should be placed halfway for passenger convenience. The station was build up where the extraction crossed the Leesville road.

Crestline was platted in 1852. It was in imitation of thought to be the highest point in Ohio and was named from its tall elevation.

This station soon developed into a town, with a general store, post office, and a few homes. Early settlers in the village believed that the town was the watershed of the state, where streams to the north emptied into Lake Erie and those to the south emptied into the Ohio River, thus the pronounce Crest Line. The town was not upon the watershed line, but the name ashore and eventually became one word.