Wilmington is a city in Clinton County, Ohio, United States, and its county seat. The population was 12,664 at the 2020 census. It is the princip…Wilmington is a city in Clinton County, Ohio, United States, and its county seat. The population was 12,664 at the 2020 census. It is the principal city of the Wilmington micropolitan area, which includes all of Clinton County and is part of the greater Cincinnati–Wilmington–Maysville combined statistical area.
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