ZIP Code 52231

52231 is one of Iowa's ZIP codes, delivering to addresses in Harper, Keokuk County.

City: Harper
County: Keokuk County
State: Iowa
Prefix: 522xx

Where this code sits

52231 is part of the 522xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Harper.

Harper Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 52231 delivers to without sharing its boundary.

641 Area code 641

ZIP codes nearest 52231

The ZIP codes whose reference points sit closest to 52231.
ZIP code	Distance	Delivers to
ZIP code 52248	4.2 mi	Keota, IA
ZIP code 52335	5.7 mi	South English, IA
ZIP code 52562	7.7 mi	Hayesville, IA
ZIP code 52355	8.4 mi	Webster, IA
ZIP code 52591	9.0 mi	Sigourney, IA
ZIP code 52316	11 mi	North English, IA
ZIP code 52359	12 mi	West Chester, IA
ZIP code 50136	12 mi	Keswick, 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 52231, plotted from its record coordinates.

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

Scope ZIP code 52231. 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.