Springfield is a city in Clark County, Ohio, United States, and its county seat. It is located in southwestern Ohio along the Mad River, Buck Creek, and Beaver Creek, about 45 miles (72 km) west of Columbus and 25 miles (40 km) northeast of Dayton. The city had a total population of 58,662 at the 2020 census, while the Springfield metropolitan area had 136,001 residents.