Bridgeport is an unincorporated community in far western Darby Township, Union County, Ohio, United States. [1] It lies at the intersection of State Route 38 with Orchard Road, midway between the villages of Milford Center and Unionville Center. At Bridgeport, Buck Run meets the Big Darby Creek,[2] which meets the Scioto River at Circleville.[2]: 68 It is located 6 miles (9.7 km) south of Marysville, the county seat of Union County.