ZIP Code 51009

51009 is one of Iowa's ZIP codes, delivering to addresses in Calumet, O'Brien County.

City: Calumet
County: O'Brien County
State: Iowa
Prefix: 510xx

Where this code sits

51009 is part of the 510xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Calumet.

Calumet Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51009 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51009

The ZIP codes whose reference points sit closest to 51009.
ZIP code	Distance	Delivers to
ZIP code 51058	4.4 mi	Sutherland, IA
ZIP code 51029	5.8 mi	Larrabee, IA
ZIP code 51046	8.1 mi	Paullina, IA
ZIP code 51245	10 mi	Primghar, IA
ZIP code 51047	11 mi	Peterson, IA
ZIP code 51037	12 mi	Meriden, IA
ZIP code 51014	12 mi	Cleghorn, IA
ZIP code 51012	14 mi	Cherokee, 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 51009, plotted from its record coordinates.

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

Scope ZIP code 51009. 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.