Monticello Illinois ZIP Codes
Monticello holds a single ZIP code.
Every ZIP code in Monticello
| ZIP code | County |
|---|---|
| 61856 | Piatt County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Monticello codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Monticello. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Monticello ZIP code begins 618. Those first three digits identify the sectional center facility that processes mail for this part of Illinois. Statewide that range covers 62 ZIP codes, so Monticello accounts for 2% of it.
Every Illinois ZIP prefix and the region it covers →
Area codes covering Monticello
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Monticello occupies.
Monticello Illinois area codes in full →
Where Monticello's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Monticello
| City | Distance | ZIP codes |
|---|---|---|
| De Land Illinois ZIP codes | 7.1 mi | 1 ZIP code |
| Bement Illinois ZIP codes | 7.6 mi | 1 ZIP code |
| Cisco Illinois ZIP codes | 8.1 mi | 1 ZIP code |
| Ivesdale Illinois ZIP codes | 8.7 mi | 1 ZIP code |
| Weldon Illinois ZIP codes | 11 mi | 1 ZIP code |
| Bondville Illinois ZIP codes | 12 mi | 1 ZIP code |
| Mansfield Illinois ZIP codes | 13 mi | 1 ZIP code |
| Sadorus Illinois ZIP codes | 13 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.