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Zip Code 52556 — Fairfield, IA

ZIP Code 52556 is associated with Fairfield, IA, in Jefferson County. The listed population estimate is 11,448; estimated density is 25.2 people per square mile. Among records with population estimates, it ranks #1 of 7 in Jefferson County and #73 of 969 in IA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (41.018420, -91.926400)

Data MetricLocal Statistic
Postal / Zip Code52556
Primary CityFairfield
State / ProvinceIA
CountyJefferson
Total Population11,448
Population Density25.2 people/sq mi
TimezoneAmerica/Chicago

How 52556 Compares

MetricZIP 52556Jefferson County recordsIA records
Population estimate11,44816,529 (sum)3,210,984 (sum)
Population Density25.2 /sq mi----
County population rank#1 of 7----
State population rank#73 of 969----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in IA

ZIP CodeCityDistancePopulation estimate
ZIP 52557Fairfield2.1 mi685
ZIP 52635Lockridge9.0 mi890
ZIP 52567Libertyville9.7 mi506
ZIP 52535Birmingham10.8 mi725
ZIP 52540Brighton11.0 mi1,088

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →