Lorain County is a county in the northeastern part of the U.S. state of Ohio As of the 2020 census, the population was 312,964. Its county seat is Elyria, and its largest city is Lorain. The county was physically established in 1822, becoming judicially independent in 1824. Lorain County is part of the Cleveland, OH Metropolitan Statistical Area. The county is home to Oberlin College.

Elyria is a city in and the county seat of Lorain County, Ohio, United States, located at the forks of the Black River in Northeast Ohio 23 miles (37 km) southwest of Cleveland. As of the 2020 census, the city had a population of 52,656. It is a principal city in the Cleveland metropolitan area. The city is home to Lorain County Community College.