Crestline is a village in Crawford and Richland Counties in the U.S. state of Ohio. The population was 5,088 at the 2000 census. It is the third largest city in Crawford County. The Crawford County portion of Crestline is part of the Bucyrus Micropolitan Statistical Area, while the small portion of the city that extends into Richland County is considered part of the Mansfield Metropolitan Statistical Area.
During its heyday, Crestline was a division point for the Pennsylvania Railroad's Pittsburgh, Fort Wayne and Chicago Railway. The city housed major engine facilities and would often be the point where motive power was changed for the relatively flat runs to and from Chicago, Illinois. The Pennsylvania Railroad's engine facilities included a roundhouse, decommissioned in 1968 in the aftermath of the merger between the Pennsylvania Railroad and the New York Central Railroad to form Penn Central. Demolition of the historic roundhouse commenced in 2007 after years of neglect. Today, Chicago, Fort Wayne and Eastern Railroad, CSX and Norfolk Southern trains operate in and around Crestline.
Crestline is located at 40°47′5″N 82°44′25″W / 40.78472°N 82.74028°W / 40.78472; -82.74028 (40.784657, -82.740192), along the Sandusky River near its headwaters.