Cincinnati is the most populous city in Hamilton County, Ohio, United States, and serves as its county seat. Settled in 1788, the city is situated on the northern side of the confluence of the Licking and Ohio rivers, with the latter defining the state line between Ohio and Kentucky.
As the third-most populous city in Ohio, Cincinnati had a population of 309,317 at the 2020 census. It functions as the economic and cultural hub of the tri-state Cincinnati metropolitan area, which is Ohio's most populous metropolitan region and ranks as the 30th-largest in the United States with over 2.3 million residents.