London is a city in and the county seat of Madison County, Ohio, United States. Located about 25 miles southwest of the Ohio capital of Colu…London is a city in and the county seat of Madison County, Ohio, United States. Located about 25 miles southwest of the Ohio capital of Columbus, London was established in 1811 to serve as the county seat. The population was 10,279 at the 2020 census. It is part of the Columbus metropolitan area.
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