page_title: Monticello, Illinois
hierarchical_section_title: Monticello, Illinois
caption_attribution_description: Piatt_County_Illinois_Courthouse
context_page_description: Monticello is a city in Piatt County, Illinois, United States. The population was 5,548 at the 2010 census, and 5,575 at a 2018 estimate. It is the county seat of Piatt County.
context_section_description: Monticello (/ˌmɒntɪˈsɛloʊ/ MON-tih-SEL-oh) is a city in Piatt County, Illinois, United States. The population was 5,548 at the 2010 census, and 5,575 at a 2018 estimate. It is the county seat of Piatt County.
caption: Piatt County Courthouse
exif: {}