ZIP Code 61728

61728 is one of Illinois's ZIP codes, delivering to addresses in Colfax, McLean County.

City: Colfax
County: McLean County
State: Illinois
Prefix: 617xx

Where this code sits

61728 is part of the 617xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Colfax.

Colfax Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61728 delivers to without sharing its boundary.

ZIP codes nearest 61728

The ZIP codes whose reference points sit closest to 61728.
ZIP code	Distance	Delivers to
ZIP code 61720	5.2 mi	Anchor, IL
ZIP code 61730	6.5 mi	Cooksville, IL
ZIP code 61731	7.0 mi	Cropsey, IL
ZIP code 61737	11 mi	Ellsworth, IL
ZIP code 61753	11 mi	Lexington, IL
ZIP code 61770	11 mi	Saybrook, IL
ZIP code 61722	11 mi	Arrowsmith, IL
ZIP code 61758	11 mi	Merna, 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 61728, plotted from its record coordinates.

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

Scope ZIP code 61728. 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.