ZIP Code 61077

61077 is one of Illinois's ZIP codes, delivering to addresses in Seward, Winnebago County.

City: Seward
County: Winnebago County
State: Illinois
Prefix: 610xx

Where this code sits

61077 is part of the 610xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Seward.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61077 delivers to without sharing its boundary.

ZIP codes nearest 61077

The ZIP codes whose reference points sit closest to 61077.
ZIP code	Distance	Delivers to
ZIP code 61063	4.8 mi	Pecatonica, IL
ZIP code 61039	5.9 mi	German Valley, IL
ZIP code 61047	6.1 mi	Leaf River, IL
ZIP code 61088	6.7 mi	Winnebago, IL
ZIP code 61067	6.9 mi	Ridott, IL
ZIP code 61010	8.8 mi	Byron, IL
ZIP code 61106	11 mi	Rockford, IL
ZIP code 61110	11 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 61077, plotted from its record coordinates.

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

Scope ZIP code 61077. 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.