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.