Monticello city, Illinois
Official LSAD Designation: Monticello city • Census GEOID: 1750244
• Piatt County
Monticello city is an incorporated city in Piatt County, Illinois. According to official records from the Census (2025), Monticello city had an estimated population of 6,080 residents. Official Census Bureau geographic records classify this community under LSAD designation Monticello city (GEOID 1750244).
Local Government Administration U.S. Census Bureau GMAF
City Of Monticello
Municipal
Official Title:
Dir Community Development
Address:
210 N HAMILTON, MONTICELLO IL 61856
County Of Piatt
County
Official Title:
Piatt County Clerk
Address:
101 W WASHINGTON ST, MONTICELLO IL 61856-1672
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 6,080 | 2025 |
| Median Household Income | $99,449 | 2020-2024 |
| Median Home Value | $210,500 | 2020-2024 |
| Land Area | 4.03 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).