Griswold Iowa ZIP Codes

Griswold holds a single ZIP code.

Every ZIP code in Griswold

The complete list of Griswold, Iowa ZIP codes with the county each falls in.
ZIP code	County
51535	Cass County

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Griswold codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Griswold. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Griswold ZIP code begins 515. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 57 ZIP codes, so Griswold accounts for 2% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Griswold

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Griswold occupies.

712 Area code 712

Griswold Iowa area codes in full →

Where Griswold's ZIP codes sit

Each point is one Griswold ZIP code, plotted from its record coordinates.

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

Cities near Griswold

The closest places to Griswold with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Lewis Iowa ZIP codes	5.7 mi	1 ZIP code
Elliott Iowa ZIP codes	6.0 mi	1 ZIP code
Grant Iowa ZIP codes	10 mi	1 ZIP code
Atlantic Iowa ZIP codes	13 mi	1 ZIP code
Cumberland Iowa ZIP codes	14 mi	1 ZIP code
Oakland Iowa ZIP codes	15 mi	1 ZIP code
Carson Iowa ZIP codes	15 mi	1 ZIP code
Marne Iowa ZIP codes	15 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance.