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Monmouth Iowa ZIP Codes

Monmouth holds a single ZIP code.

Every ZIP code in Monmouth

The complete list of Monmouth, Iowa ZIP codes with the county each falls in.
ZIP codeCounty
52309Jackson 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Monmouth codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Monmouth. 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 Monmouth ZIP code begins 523. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 53 ZIP codes, so Monmouth accounts for 2% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Monmouth

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 Monmouth occupies.

Monmouth Iowa area codes in full →

Where Monmouth's ZIP codes sit

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

Cities near Monmouth

The closest places to Monmouth with their own ZIP code list, nearest first.
CityDistanceZIP codes
Baldwin Iowa ZIP codes2.2 mi1 ZIP code
Wyoming Iowa ZIP codes6.4 mi1 ZIP code
Onslow Iowa ZIP codes7.2 mi1 ZIP code
Oxford Junction Iowa ZIP codes7.3 mi1 ZIP code
Lost Nation Iowa ZIP codes8.1 mi1 ZIP code
Maquoketa Iowa ZIP codes11 mi1 ZIP code
Olin Iowa ZIP codes14 mi1 ZIP code
Delmar Iowa ZIP codes15 mi1 ZIP code

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