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1 day ago · 1086201 [5] Website. cincinnati-oh .gov. Cincinnati ( / ˌsɪnsɪˈnæti / SIN-si-NAT-ee, nicknamed Cincy) is a city in and the county seat of Hamilton County, Ohio, United States. [10] Settled in 1788, the city is located on the northern side of the confluence of the Licking and Ohio rivers, the latter of which marks the state line with Kentucky.