ZIP Code 51537

51537 is one of Iowa's ZIP codes, delivering to addresses in Harlan, Shelby County.

City: Harlan
County: Shelby County
State: Iowa
Prefix: 515xx

Where this code sits

51537 is part of the 515xx range, the group of codes handled by one mail processing centre. Harlan is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Harlan page.

Harlan Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51537 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51537

The ZIP codes whose reference points sit closest to 51537.
ZIP code	Distance	Delivers to
ZIP code 51447	6.4 mi	Kirkman, IA
ZIP code 51578	6.8 mi	Westphalia, IA
ZIP code 51565	10 mi	Portsmouth, IA
ZIP code 51570	10 mi	Shelby, IA
ZIP code 51593	10 mi	Harlan, IA
ZIP code 51562	11 mi	Panama, IA
ZIP code 51446	11 mi	Irwin, IA
ZIP code 51527	11 mi	Defiance, 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 51537, plotted from its record coordinates.

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

Scope ZIP code 51537. 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.