Decorah Iowa ZIP Codes

Decorah holds a single ZIP code.

Every ZIP code in Decorah

The complete list of Decorah, Iowa ZIP codes with the county each falls in.
ZIP code	County
52101	Winneshiek 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Decorah codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Decorah. 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 Decorah ZIP code begins 521. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 33 ZIP codes, so Decorah accounts for 3% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Decorah

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 Decorah occupies.

563 Area code 563

Decorah Iowa area codes in full →

Where Decorah's ZIP codes sit

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

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

Cities near Decorah

The closest places to Decorah with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Calmar Iowa ZIP codes	9.3 mi	1 ZIP code
Ridgeway Iowa ZIP codes	10 mi	1 ZIP code
Ossian Iowa ZIP codes	11 mi	1 ZIP code
Spillville Iowa ZIP codes	11 mi	1 ZIP code
Fort Atkinson Iowa ZIP codes	13 mi	1 ZIP code
Castalia Iowa ZIP codes	14 mi	1 ZIP code
Waukon Iowa ZIP codes	16 mi	1 ZIP code
Protivin Iowa ZIP codes	16 mi	1 ZIP code

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