ZIP Code 51545

51545 is one of Iowa's ZIP codes, delivering to addresses in Little Sioux, Harrison County.

City: Little Sioux
County: Harrison County
State: Iowa
Prefix: 515xx

Where this code sits

51545 is part of the 515xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Little Sioux.

Little Sioux Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51545 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51545

The ZIP codes whose reference points sit closest to 51545.
ZIP code	Distance	Delivers to
ZIP code 51564	5.8 mi	Pisgah, IA
ZIP code 51557	7.0 mi	Mondamin, IA
ZIP code 51523	8.4 mi	Blencoe, IA
ZIP code 68061	10 mi	Tekamah, NE
ZIP code 51550	11 mi	Magnolia, IA
ZIP code 51556	12 mi	Modale, IA
ZIP code 51558	13 mi	Moorhead, IA
ZIP code 51040	16 mi	Onawa, 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 51545, plotted from its record coordinates.

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

Scope ZIP code 51545. 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.