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City ZIP codes · Iowa

Fairfield, IA ZIP Codes

2 ZIP codes use the postal name Fairfield, Iowa (Census 2020 ZCTAs and GeoNames postal codes, October 2026), all residential. Fairfield's most populous ZIP code is 52556, with 11,448 people (ACS 2020-2024); 4% of its land is in the city of Fairfield.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Fairfield's ZIP codes?

52556: $59k median household income52557: – median household income5255652556: $59k median household income52557: – median household income5255652556: $59k median household income52557: – median household income52556
The 2 residential ZIP codes named Fairfield, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

All 2 residential ZIP codes of Fairfield

Residential ZIP codes with the postal name Fairfield, IA, largest first (ACS 2020-2024); sort by any column
County
52556 Jefferson County 11,448 65 $59k $167k
52557 Jefferson County 685 2,566 – –

Download the 2 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

Which counties do Fairfield's ZIP codes reach?

Fairfield's residential ZIP codes lie in Jefferson County.

Which places do Fairfield's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, Fairfield's residential ZIP codes cover Fairfield itself and 1 other place, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

  • Maharishi Vedic City 52556

Source: U.S. Census Bureau, 2020 ZCTA-to-place relationship file (shares of land).

Which first three digits do Fairfield's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Fairfield starts with 525.

Three-digit prefixes of Fairfield's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Fairfield's
PrefixSectional centerHereAll codes
525 Des Moines, IA (SCF 500) 2 50

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.