Belleville is a city in St. Clair County, Illinois, United States, co-extensive with Belleville Township. As of the 2010 census, the city has a population of 44,478. It is the ninth-most populated city outside of the Chicago Metropolitan Area and the most populated city south of Springfield in the state of Illinois. It is the county seat of St. Clair County, and the seat of the Roman Catholic Diocese of Belleville and the National Shrine of Our Lady of the Snows. Belleville is the most populated city in the Metro-East region of the St. Louis Metropolitan Area and in Southern Illinois. The... city of Belleville was named by George Blair in 1814. Blair was born in 1760 and his father was born in Scotland. Blair donated an acre of his land for the Town Square and an additional 25 acres that adjoined the Square for the new County Seat, causing the county seat to be transferred from the village of Cahokia. Belleville was incorporated as a village in 1819, and became a city in 1850. It is said that Blair named the city Belleville because he believed that a French name would attract new residents.
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