Cincinnati ( SIN-si-NAT-ee) is a city in the U.S. state of Ohio and the county seat of Hamilton County. Settled in 1788, the city is located at the northern side of the confluence of the Licking and Ohio rivers, the latter of which marks the state line with Kentucky. The city is the economic and cultural hub of the Cincinnati metropolitan area. With an estimated population of 2,256,884, it is Ohio's largest metropolitan area and the nation's 30th-largest, and with a city population of 309,317, Cincinnati is the third-largest city in Ohio and 65th in the United States. Throughout much of the 19th century, it was among the top 10 U.S. cities by population, surpassed only by New Orleans and the older, established settlements of the United States eastern seaboard, as well as being the sixth-most populous city from 1840 until 1860.

As a river town crossroads at the junction of the North, South, East, and West, Cincinnati developed with fewer immigrants and less influence from Europe than East Coast cities in the same period. However, it received a significant number of German-speaking immigrants, who founded many of the city's cultural institutions. By the end of the 19th century, with the shift from steamboats to railroads drawing off freight shipping, trade patterns had altered and Cincinnati's growth slowed considerably. The city was surpassed in population by other inland cities, particularly Chicago, which developed based on strong commodity exploitation, economics, and the railroads, and St. Louis, which for decades after the Civil War served as the gateway to westward migration.

Cincinnati is home to three professional sports teams: the Cincinnati Reds of Major League Baseball; the Cincinnati Bengals of the National Football League; and FC Cincinnati of Major League Soccer; it is also home to the Cincinnati Cyclones, a minor league ice hockey team. The city's largest institution of higher education, the University of Cincinnati, was founded in 1819 as a municipal college and is now ranked as one of the 50 largest in the United States. Cincinnati is home to historic architecture with many structures in the urban core having remained intact for 200 years. In the late 1800s, Cincinnati was commonly referred to as the "Paris of America", due mainly to such ambitious architectural projects as the Music Hall, Cincinnatian Hotel, and Shillito Department Store. Cincinnati is the birthplace of William Howard Taft, the 27th President and former Chief Justice of the United States. Recently, Cincinnati has been named among the 100 most livable cities in the world, at number 88, and is on many Best Places to Live lists, including Livability.com and US News and World Report.