ZIP Code 51239

51239 is one of Iowa's ZIP codes, delivering to addresses in Hull, Sioux County.

City: Hull
County: Sioux County
State: Iowa
Prefix: 512xx

Where this code sits

51239 is part of the 512xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Hull.

Hull Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51239 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51239

The ZIP codes whose reference points sit closest to 51239.
ZIP code	Distance	Delivers to
ZIP code 51235	7.1 mi	Doon, IA
ZIP code 51234	7.9 mi	Boyden, IA
ZIP code 51250	8.1 mi	Sioux Center, IA
ZIP code 51247	8.6 mi	Rock Valley, IA
ZIP code 51244	11 mi	Matlock, IA
ZIP code 51230	12 mi	Alvord, IA
ZIP code 51237	13 mi	George, IA
ZIP code 51041	13 mi	Orange City, 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 51239, plotted from its record coordinates.

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

Scope ZIP code 51239. 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.