Crawford County is a county located in the north central portion of the U.S. state of Ohio. As of the 2020 census, the population was 42,025. Its county seat and largest city is Bucyrus. The county was created in 1820 and later organized in 1836. It was named for Colonel William Crawford, a soldier during the American Revolution. Crawford County comprises the Bucyrus, OH Micropolitan Statistical Area, which is also included in the Mansfield-Ashland-Bucyrus, OH Combined Statistical Area.

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 and 66 miles (106 km) southeast of Toledo. The population was 11,684 at the time of the 2020 census. The city is the largest in Crawford County, and the center of the Bucyrus Micropolitan Statistical Area.