Calumet Iowa ZIP Codes

Calumet holds a single ZIP code.

Every ZIP code in Calumet

The complete list of Calumet, Iowa ZIP codes with the county each falls in.
ZIP code	County
51009	O'Brien 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Calumet codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Calumet. 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 Calumet 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 Calumet accounts for 2% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Calumet

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 Calumet occupies.

712 Area code 712

Calumet Iowa area codes in full →

Where Calumet's ZIP codes sit

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

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

Cities near Calumet

The closest places to Calumet with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Sutherland Iowa ZIP codes	3.4 mi	1 ZIP code
Larrabee Iowa ZIP codes	5.8 mi	1 ZIP code
Paullina Iowa ZIP codes	7.1 mi	1 ZIP code
Primghar Iowa ZIP codes	10 mi	1 ZIP code
Peterson Iowa ZIP codes	11 mi	1 ZIP code
Meriden Iowa ZIP codes	11 mi	1 ZIP code
Cleghorn Iowa ZIP codes	12 mi	1 ZIP code
Cherokee Iowa ZIP codes	14 mi	1 ZIP code

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