Monticello is a city in Illinois. So far we have accumulated 0 streets in Monticello and on these streets we have added 0 real estate properties.
- Federal District
Monticello (/m?nt?'s?lo?/, mon-t?-SSEL-loh) 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.