ZIP Code 51010

51010 is one of Iowa's ZIP codes, delivering to addresses in Castana, Monona County.

City: Castana
County: Monona County
State: Iowa
Prefix: 510xx

Where this code sits

51010 is part of the 510xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Castana.

Castana Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51010 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51010

The ZIP codes whose reference points sit closest to 51010.
ZIP code	Distance	Delivers to
ZIP code 51034	8.4 mi	Mapleton, IA
ZIP code 51572	8.5 mi	Soldier, IA
ZIP code 51051	9.2 mi	Rodney, IA
ZIP code 51060	10 mi	Ute, IA
ZIP code 51040	11 mi	Onawa, IA
ZIP code 51558	12 mi	Moorhead, IA
ZIP code 51056	12 mi	Smithland, IA
ZIP code 51044	13 mi	Oto, 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 51010, plotted from its record coordinates.

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

Scope ZIP code 51010. 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.