ZIP Code 61243

61243 is one of Illinois's ZIP codes, delivering to addresses in Deer Grove, Whiteside County.

City: Deer Grove
County: Whiteside County
State: Illinois
Prefix: 612xx

Where this code sits

61243 is part of the 612xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Deer Grove.

Deer Grove Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61243 delivers to without sharing its boundary.

ZIP codes nearest 61243

The ZIP codes whose reference points sit closest to 61243.
ZIP code	Distance	Delivers to
ZIP code 61283	5.2 mi	Tampico, IL
ZIP code 61376	7.8 mi	Walnut, IL
ZIP code 61042	8.0 mi	Harmon, IL
ZIP code 61346	8.3 mi	New Bedford, IL
ZIP code 61071	9.3 mi	Rock Falls, IL
ZIP code 61037	11 mi	Galt, IL
ZIP code 61081	12 mi	Sterling, IL
ZIP code 61338	12 mi	Manlius, 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 61243, plotted from its record coordinates.

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

Scope ZIP code 61243. 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.