Delaware is a city in Delaware County, Ohio, United States, and its county seat. It is located near the center of Ohio, about 30 miles north of Col…Delaware is a city in Delaware County, Ohio, United States, and its county seat. It is located near the center of Ohio, about 30 miles north of Columbus as part of the Columbus metropolitan area. The population was 41,302 at the 2020 census. Delaware was founded in 1808 and was incorporated in 1816.
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