ZIP Code 60423

60423 is one of Illinois's ZIP codes, delivering to addresses in Frankfort, Will County.

City: Frankfort
County: Will County
State: Illinois
Prefix: 604xx

Where this code sits

60423 is part of the 604xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Frankfort.

Frankfort Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 60423 delivers to without sharing its boundary.

ZIP codes nearest 60423

The ZIP codes whose reference points sit closest to 60423.
ZIP code	Distance	Delivers to
ZIP code 60487	3.8 mi	Tinley Park, IL
ZIP code 60448	3.8 mi	Mokena, IL
ZIP code 60443	4.4 mi	Matteson, IL
ZIP code 60477	5.2 mi	Tinley Park, IL
ZIP code 60471	5.6 mi	Richton Park, IL
ZIP code 60478	6.4 mi	Country Club Hills, IL
ZIP code 60431	6.5 mi	Joliet, IL
ZIP code 60449	6.8 mi	Monee, 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 60423, plotted from its record coordinates.

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

Scope ZIP code 60423. 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.