Monticello, Illinois
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.
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.