Castana Iowa ZIP Codes

Castana holds a single ZIP code.

Every ZIP code in Castana

The complete list of Castana, Iowa ZIP codes with the county each falls in.
ZIP code	County
51010	Monona 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Castana codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Castana. 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 Castana ZIP code begins 510. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 55 ZIP codes, so Castana accounts for 2% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Castana

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 Castana occupies.

712 Area code 712

Castana Iowa area codes in full →

Where Castana's ZIP codes sit

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

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

Cities near Castana

The closest places to Castana with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Mapleton Iowa ZIP codes	8.9 mi	1 ZIP code
Soldier Iowa ZIP codes	9.1 mi	1 ZIP code
Rodney Iowa ZIP codes	9.3 mi	1 ZIP code
Onawa Iowa ZIP codes	9.8 mi	1 ZIP code
Ute Iowa ZIP codes	11 mi	1 ZIP code
Smithland Iowa ZIP codes	11 mi	1 ZIP code
Moorhead Iowa ZIP codes	11 mi	1 ZIP code
Whiting Iowa ZIP codes	13 mi	1 ZIP code

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