Springboro is a city in the U.S. state of Ohio. Regarded as a suburb of Cincinnati and Dayton, it is located mostly in Warren County in Clearcreek and Franklin Townships; with a small portion in Miami Township in Montgomery County. The city is part of the Miami Valley. As of the 2020 census, the city had a population of 19,062. Springboro is located at the geographic center of the Cincinnati-Dayton Metroplex, the 14th largest urban area in the United States.