ZIP Code 51535

51535 is one of Iowa's ZIP codes, delivering to addresses in Griswold, Cass County.

City: Griswold
County: Cass County
State: Iowa
Prefix: 515xx

Where this code sits

51535 is part of the 515xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Griswold.

Griswold Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51535 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51535

The ZIP codes whose reference points sit closest to 51535.
ZIP code	Distance	Delivers to
ZIP code 51544	5.8 mi	Lewis, IA
ZIP code 51532	7.3 mi	Elliott, IA
ZIP code 50847	10 mi	Grant, IA
ZIP code 50022	13 mi	Atlantic, IA
ZIP code 51560	14 mi	Oakland, IA
ZIP code 50843	14 mi	Cumberland, IA
ZIP code 51591	14 mi	Red Oak, IA
ZIP code 51525	15 mi	Carson, 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 51535, plotted from its record coordinates.

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

Scope ZIP code 51535. 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.