ZIP Code 61261

61261 is one of Illinois's ZIP codes, delivering to addresses in Lyndon, Whiteside County.

City: Lyndon
County: Whiteside County
State: Illinois
Prefix: 612xx

Where this code sits

61261 is part of the 612xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Lyndon.

Lyndon Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61261 delivers to without sharing its boundary.

ZIP codes nearest 61261

The ZIP codes whose reference points sit closest to 61261.
ZIP code	Distance	Delivers to
ZIP code 61277	6.3 mi	Prophetstown, IL
ZIP code 61251	6.7 mi	Fenton, IL
ZIP code 61270	7.2 mi	Morrison, IL
ZIP code 61283	7.8 mi	Tampico, IL
ZIP code 61037	9.3 mi	Galt, IL
ZIP code 61250	9.7 mi	Erie, IL
ZIP code 61071	12 mi	Rock Falls, IL
ZIP code 61081	12 mi	Sterling, 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 61261, plotted from its record coordinates.

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

Scope ZIP code 61261. 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.