Overpeck (other names: Overpeck Station, Overpecks, Overpecks Station) is an unincorporated community in central St. Clair Township, Butler County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 45055. It lies between New Miami and Trenton.Overpeck is a part of the Cincinnati-Middletown-Wilmington, OH-KY-IN Combined Statistical Area.