ZIP code · Monmouth · Iowa · United States
ZIP code 52309 — Monmouth
ZIP code 52309 serves Monmouth, Iowa.
- Postal code
- 52309Single source Value from one source, not cross-checked.
- City
- Monmouth
- County
- Jackson
- State
- Iowa
- Country
- United States
- Coordinates
- 42.0772, -90.8786 — precision precise (locality)
View on OpenStreetMap - Population
- 446 (ZCTA, ACS 5-year)
- Median household income
- $64,500
- Median age
- 58
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · census-acs5. Data generated on 2026-08-21. Methodology · Report an error on this page