ZIP Code 61103

61103 is one of Illinois's ZIP codes, delivering to addresses in Rockford, Winnebago County.

City: Rockford
County: Winnebago County
State: Illinois
Prefix: 611xx

Where this code sits

61103 is part of the 611xx range, the group of codes handled by one mail processing centre. Rockford is served by 14 ZIP codes in total; the full list, with the county each falls in, is on the Rockford page.

Rockford Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61103 delivers to without sharing its boundary.

ZIP codes nearest 61103

The ZIP codes whose reference points sit closest to 61103.
ZIP code	Distance	Delivers to
ZIP code 61101	1.8 mi	Rockford, IL
ZIP code 61105	2.1 mi	Rockford, IL
ZIP code 61107	2.9 mi	Rockford, IL
ZIP code 61104	3.2 mi	Rockford, IL
ZIP code 61111	3.2 mi	Loves Park, IL
ZIP code 61102	3.8 mi	Rockford, IL
ZIP code 61115	4.3 mi	Machesney Park, IL
ZIP code 61114	4.6 mi	Rockford, 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 61103, plotted from its record coordinates.

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

Scope ZIP code 61103. 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.