ZIP Code 52309

52309 is one of Iowa's ZIP codes, delivering to addresses in Monmouth, Jackson County.

City: Monmouth
County: Jackson County
State: Iowa
Prefix: 523xx

Where this code sits

52309 is part of the 523xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Monmouth.

Monmouth Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 52309 delivers to without sharing its boundary.

563 Area code 563

ZIP codes nearest 52309

The ZIP codes whose reference points sit closest to 52309.
ZIP code	Distance	Delivers to
ZIP code 52207	3.0 mi	Baldwin, IA
ZIP code 52362	6.0 mi	Wyoming, IA
ZIP code 52321	7.3 mi	Onslow, IA
ZIP code 52323	7.4 mi	Oxford Junction, IA
ZIP code 52254	7.6 mi	Lost Nation, IA
ZIP code 52060	10 mi	Maquoketa, IA
ZIP code 52212	11 mi	Center Junction, IA
ZIP code 52320	15 mi	Olin, IA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 52309, plotted from its record coordinates.

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

Scope ZIP code 52309. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.