Lima is a city in and the county seat of Allen County, Ohio, United States. As of the 2020 census, the city had a population of 35,579. It is located in northwest Ohio along Interstate 75, approximately 72 miles (116 km) north of Dayton, 78 miles (126 km) southwest of Toledo, and 63 mi (101 km) southeast of Fort Wayne, Indiana.

Allen County is a county located in the northwestern part of the U.S. state of Ohio. Its county seat and largest city is Lima. The county was created in 1820 and organized in 1831. The county is named in honor of Colonel John Allen, who was killed leading his men at the Battle of Frenchtown during the War of 1812.