ZIP Code 61231

61231 is one of Illinois's ZIP codes, delivering to addresses in Aledo, Mercer County.

City: Aledo
County: Mercer County
State: Illinois
Prefix: 612xx

Where this code sits

61231 is part of the 612xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Aledo.

Aledo Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61231 delivers to without sharing its boundary.

ZIP codes nearest 61231

The ZIP codes whose reference points sit closest to 61231.
ZIP code	Distance	Delivers to
ZIP code 61260	6.0 mi	Joy, IL
ZIP code 61486	7.7 mi	Viola, IL
ZIP code 61263	7.8 mi	Matherville, IL
ZIP code 61476	9.8 mi	Seaton, IL
ZIP code 61279	10 mi	Reynolds, IL
ZIP code 61276	11 mi	Preemption, IL
ZIP code 61237	11 mi	Buffalo Prairie, IL
ZIP code 61442	12 mi	Keithsburg, 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 61231, plotted from its record coordinates.

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

Scope ZIP code 61231. 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.