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Monticello is a city in Piatt County, Illinois, United States. The population was 5,138 at the 2000 census, and 5,374 at a 2009 estimate. It is the county seat of Piatt County.GeographyMonticello is located at .According to the 2010 census, Monticello has a total area of 3.829sqmi, of which 3.8sqmi is land and 0.029sqmi is water.Monticello is located in East Central Illinois between the cities of Decatur and Champaign, Illinois.Monticello is nearly equidistant from Chicago, St. Louis, and Indianapolis.LandmarksRobert Allerton Park, which belongs to the University of Illinois at Urbana-Champaign and includes a conference center, a garden, summer camp location, and forest art museum, is located just outside Monticello.HistoryMonticello's first resident was George Haworth. Haworth came to the area in 1822 to serve as a U.S. liaison agent to local Native American tribes. Haworth did not remain, but in 1829, James A. Piatt purchased Haworth's small log cabin. Soon more settlers arrived.In 1837, residents decided to form a new town. Abraham Marquiss, William Barnes, James McReynolds, and James A. Piatt Jr. formed a joint stock company and purchased land from James A. Piatt. Upon McReynold's suggestion, the town was christened Monticello – after the home of Thomas Jefferson. Monticello officially became a town on July 1, 1837. Townsfolk held a celebration on July 4.Monticello is in Illinois (IL). Plan your vacation with our United States road trip app and discover the best things to do in Monticello.
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