Monticello is a city located in the state of Illinois within the United States. It serves as the county seat for Piatt County.
According to the 2020 census, the population of Monticello was 5,941.
United States
Monticello is a city located in the state of Illinois within the United States. It serves as the county seat for Piatt County.
According to the 2020 census, the population of Monticello was 5,941.