Hamilton is a city in and the county seat of Butler County, Ohio, United States. Located 20 miles north of Cincinnati, Hamilton is the second-l…Hamilton is a city in and the county seat of Butler County, Ohio, United States. Located 20 miles north of Cincinnati, Hamilton is the second-largest city in the Greater Cincinnati area and the tenth-largest city in Ohio. The population was 63,399 at the 2020 census. Most of the city is served by the Hamilton City School District.
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