Bucyrus ( ) is a city in the U.S. state of Ohio and the county seat of Crawford County, located in northern Ohio approximately 28 miles (45 km) west of Mansfield. The population was 12,362 at the 2010 census. The city is the largest in Crawford County, and the center of the Bucyrus Micropolitan Statistical Area (as defined by the United States Census Bureau in 2003).