ZIP Code 61856

61856 is one of Illinois's ZIP codes, delivering to addresses in Monticello, Piatt County.

City: Monticello
County: Piatt County
State: Illinois
Prefix: 618xx

Where this code sits

61856 is part of the 618xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Monticello.

Monticello Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61856 delivers to without sharing its boundary.

ZIP codes nearest 61856

The ZIP codes whose reference points sit closest to 61856.
ZIP code	Distance	Delivers to
ZIP code 61884	5.8 mi	White Heath, IL
ZIP code 61839	6.9 mi	De Land, IL
ZIP code 61830	7.0 mi	Cisco, IL
ZIP code 61813	7.2 mi	Bement, IL
ZIP code 61851	8.4 mi	Ivesdale, IL
ZIP code 61855	8.6 mi	Milmine, IL
ZIP code 61875	9.3 mi	Seymour, IL
ZIP code 61882	12 mi	Weldon, IL

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 61856, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 61856. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.