Peoria /piːˈɔəriə/ is a city in and the county seat of Peoria County, Illinois, United States, and the largest city on the Illinois River. Established in 1691 by the French explorer Henri de Tonti, Peoria is the oldest European settlement in Illinois, and is named after the Peoria tribe. As of the 2010 census, the city was the seventh-most populated in Illinois (and the third largest outside of Chicagoland), with a population of 115,007. The Peoria Metropolitan Statistical Area had a population of 373,590 in 2011. Peoria had a population of 118,943 in 2010, when far northern Peoria was also included.