ZIP Code 51056

51056 is one of Iowa's ZIP codes, delivering to addresses in Smithland, Woodbury County.

City: Smithland
County: Woodbury County
State: Iowa
Prefix: 510xx

Where this code sits

51056 is part of the 510xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Smithland.

Smithland Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51056 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51056

The ZIP codes whose reference points sit closest to 51056.
ZIP code	Distance	Delivers to
ZIP code 51051	3.3 mi	Rodney, IA
ZIP code 51044	4.7 mi	Oto, IA
ZIP code 51026	7.5 mi	Hornick, IA
ZIP code 51034	9.9 mi	Mapleton, IA
ZIP code 51015	10 mi	Climbing Hill, IA
ZIP code 51004	11 mi	Anthon, IA
ZIP code 51019	12 mi	Danbury, IA
ZIP code 51010	12 mi	Castana, 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 51056, plotted from its record coordinates.

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

Scope ZIP code 51056. 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.