ZIP Code 51591

51591 is one of Iowa's ZIP codes, delivering to addresses in Red Oak, Montgomery County.

City: Red Oak
County: Montgomery County
State: Iowa
Prefix: 515xx

Where this code sits

51591 is part of the 515xx range, the group of codes handled by one mail processing centre. Red Oak is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Red Oak page.

Red Oak Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51591 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51591

The ZIP codes whose reference points sit closest to 51591.
ZIP code	Distance	Delivers to
ZIP code 51566	4.0 mi	Red Oak, IA
ZIP code 51573	4.3 mi	Stanton, IA
ZIP code 51532	6.9 mi	Elliott, IA
ZIP code 50864	11 mi	Villisca, IA
ZIP code 50847	12 mi	Grant, IA
ZIP code 51533	13 mi	Emerson, IA
ZIP code 51535	14 mi	Griswold, IA
ZIP code 51638	15 mi	Essex, 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 51591, plotted from its record coordinates.

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

Scope ZIP code 51591. 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.