ZIP Code 50255

50255 is one of Iowa's ZIP codes, delivering to addresses in Thornburg, Keokuk County.

City: Thornburg
County: Keokuk County
State: Iowa
Prefix: 502xx

Where this code sits

50255 is part of the 502xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Thornburg.

Thornburg Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 50255 delivers to without sharing its boundary.

641 Area code 641

ZIP codes nearest 50255

The ZIP codes whose reference points sit closest to 50255.
ZIP code	Distance	Delivers to
ZIP code 50104	3.4 mi	Gibson, IA
ZIP code 50268	4.2 mi	What Cheer, IA
ZIP code 50136	5.0 mi	Keswick, IA
ZIP code 50027	7.3 mi	Barnes City, IA
ZIP code 52222	8.2 mi	Deep River, IA
ZIP code 52355	8.3 mi	Webster, IA
ZIP code 52550	9.5 mi	Delta, IA
ZIP code 52591	11 mi	Sigourney, IA

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 50255, plotted from its record coordinates.

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

Scope ZIP code 50255. 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.