City · Illinois · United States
Monticello, IL — ZIP codes
1 ZIP code · Piatt County
- City
- Monticello
- County
- Piatt
- State
- Illinois
- Country
- United States
- Postal code
- 61856Single source
- Coordinates
- 40.0263, -88.5686 View on OpenStreetMap
- Area code
- 217
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 61856 | Monticello | Single source |
Sources and verification
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Last generated : 2026-08-21. Report an error.