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Humboldt Iowa ZIP Codes

Humboldt holds a single ZIP code.

Every ZIP code in Humboldt

The complete list of Humboldt, Iowa ZIP codes with the county each falls in.
ZIP codeCounty
50548Humboldt 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Humboldt codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Humboldt. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Humboldt ZIP code begins 505. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 75 ZIP codes, so Humboldt accounts for 1% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Humboldt

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 Humboldt occupies.

Humboldt Iowa area codes in full →

Where Humboldt's ZIP codes sit

Each point is one Humboldt ZIP code, plotted from its record coordinates.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Cities near Humboldt

The closest places to Humboldt with their own ZIP code list, nearest first.
CityDistanceZIP codes
Dakota City Iowa ZIP codes1.4 mi1 ZIP code
Rutland Iowa ZIP codes4.4 mi1 ZIP code
Badger Iowa ZIP codes8.6 mi1 ZIP code
Thor Iowa ZIP codes9.2 mi1 ZIP code
Livermore Iowa ZIP codes10 mi1 ZIP code
Bode Iowa ZIP codes11 mi1 ZIP code
Hardy Iowa ZIP codes11 mi1 ZIP code
Gilmore City Iowa ZIP codes11 mi1 ZIP code

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