ZIP Code 51603

51603 is one of Iowa's ZIP codes, delivering to addresses in Shenandoah, Page County.

City: Shenandoah
County: Page County
State: Iowa
Prefix: 516xx

Where this code sits

51603 is part of the 516xx range, the group of codes handled by one mail processing centre. Shenandoah is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Shenandoah page.

Shenandoah Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51603 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51603

The ZIP codes whose reference points sit closest to 51603.
ZIP code	Distance	Delivers to
ZIP code 51601	0.6 mi	Shenandoah, IA
ZIP code 51639	6.3 mi	Farragut, IA
ZIP code 51638	6.8 mi	Essex, IA
ZIP code 51645	7.5 mi	Imogene, IA
ZIP code 51636	10 mi	Coin, IA
ZIP code 51647	11 mi	Northboro, IA
ZIP code 51656	12 mi	Yorktown, IA
ZIP code 51649	12 mi	Randolph, 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 51603, plotted from its record coordinates.

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

Scope ZIP code 51603. 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.