ZIP Code 51638

51638 is one of Iowa's ZIP codes, delivering to addresses in Essex, Page County.

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

Where this code sits

51638 is part of the 516xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Essex.

Essex Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51638 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51638

The ZIP codes whose reference points sit closest to 51638.
ZIP code	Distance	Delivers to
ZIP code 51603	6.8 mi	Shenandoah, IA
ZIP code 51601	6.9 mi	Shenandoah, IA
ZIP code 51645	7.8 mi	Imogene, IA
ZIP code 51656	9.9 mi	Yorktown, IA
ZIP code 51566	12 mi	Red Oak, IA
ZIP code 51636	12 mi	Coin, IA
ZIP code 51639	13 mi	Farragut, IA
ZIP code 51573	14 mi	Stanton, 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 51638, plotted from its record coordinates.

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

Scope ZIP code 51638. 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.