ZIP Code 52557

52557 is one of Iowa's ZIP codes, delivering to addresses in Fairfield, Jefferson County.

City: Fairfield
County: Jefferson County
State: Iowa
Prefix: 525xx

Where this code sits

52557 is part of the 525xx range, the group of codes handled by one mail processing centre. Fairfield is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Fairfield page.

Fairfield Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 52557 delivers to without sharing its boundary.

ZIP codes nearest 52557

The ZIP codes whose reference points sit closest to 52557.
ZIP code	Distance	Delivers to
ZIP code 52556	1.0 mi	Fairfield, IA
ZIP code 52567	5.5 mi	Libertyville, IA
ZIP code 52580	8.9 mi	Packwood, IA
ZIP code 52533	9.3 mi	Batavia, IA
ZIP code 52635	11 mi	Lockridge, IA
ZIP code 52535	11 mi	Birmingham, IA
ZIP code 52540	12 mi	Brighton, IA
ZIP code 52585	12 mi	Richland, 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 52557, plotted from its record coordinates.

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

Scope ZIP code 52557. 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.