ZIP Code 51234

51234 is one of Iowa's ZIP codes, delivering to addresses in Boyden, Sioux County.

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

Where this code sits

51234 is part of the 512xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Boyden.

Boyden Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51234 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51234

The ZIP codes whose reference points sit closest to 51234.
ZIP code	Distance	Delivers to
ZIP code 51244	3.7 mi	Matlock, IA
ZIP code 51201	7.3 mi	Sheldon, IA
ZIP code 51239	7.9 mi	Hull, IA
ZIP code 51238	9.2 mi	Hospers, IA
ZIP code 51237	9.7 mi	George, IA
ZIP code 51235	13 mi	Doon, IA
ZIP code 51232	13 mi	Ashton, IA
ZIP code 51250	13 mi	Sioux Center, 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 51234, plotted from its record coordinates.

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

Scope ZIP code 51234. 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.