ZIP Code 61257

61257 is one of Illinois's ZIP codes, delivering to addresses in Hillsdale, Rock Island County.

City: Hillsdale
County: Rock Island County
State: Illinois
Prefix: 612xx

Where this code sits

61257 is part of the 612xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Hillsdale.

Hillsdale Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61257 delivers to without sharing its boundary.

ZIP codes nearest 61257

The ZIP codes whose reference points sit closest to 61257.
ZIP code	Distance	Delivers to
ZIP code 61275	5.2 mi	Port Byron, IL
ZIP code 61278	6.1 mi	Rapids City, IL
ZIP code 52753	7.1 mi	Le Claire, IA
ZIP code 61242	8.1 mi	Cordova, IL
ZIP code 61250	8.5 mi	Erie, IL
ZIP code 61236	8.7 mi	Barstow, IL
ZIP code 61241	8.7 mi	Colona, IL
ZIP code 61254	9.0 mi	Geneseo, 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 61257, plotted from its record coordinates.

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

Scope ZIP code 61257. 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.