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Cincinnati was settled in 1788 on the Ohio River, incorporated as a town on January 1, 1802, and as a city on March 1, 1820; it was named for the Society of the Cincinnati, which itself honored the Roman statesman Cincinnatus.

Cincinnati is the county seat of Hamilton County and sits on the Ohio River at the mouth of the Licking River, directly across from Kentucky.

Cincinnati has been known by many nicknames, including the 'Queen City', 'Porkopolis' from its pork-packing era, the 'City of Seven Hills', and 'The Birthplace of Professional Baseball'.

Cincinnati had 309,317 residents in the 2020 census, making it Ohio's third most populous city, with an estimated 314,367 in 2025 and about 144,000 households; its metropolitan area of about 2.26 million people is the largest in Ohio.

The 1869 Cincinnati Red Stockings were the first professional baseball team, going undefeated at 57-0 that season, and the city's later 'Big Red Machine' Reds won back-to-back World Series titles in 1975 and 1976.

Cincinnati's Over-the-Rhine neighborhood holds one of the largest collections of Italianate architecture in the United States, built largely by German immigrants and named after the canal its residents jokingly called 'the Rhine'.

Findlay Market, operating since 1852 in Over-the-Rhine, is Ohio's oldest continuously operated public market.

Cincinnati-style chili was created by Greek and Macedonian immigrants in the 1920s and is served over spaghetti in 'ways' - a 3-Way comes with shredded cheddar - at parlors like Skyline Chili, founded in 1949; locals eat more than 2 million pounds of it a year.

The John A. Roebling Suspension Bridge, opened in 1866 across the Ohio River, was the longest suspension bridge in the world at the time and served as the prototype for Roebling's Brooklyn Bridge.

The University of Cincinnati was founded in 1819 and is one of the oldest public universities in the United States.