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Zip Code 51104 — Sioux City, IA

51104 is a ZIP Code associated with Sioux City, IA, located within Woodbury. 51104 ranks #2 out of 20 ZIP codes in Woodbury County by population (and #36 out of 970 in IA). The area supports an estimated population of 23,197 residents across Data Pending housing units, with a population density of 1,198.1 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (42.535180, -96.403890)

Data MetricLocal Statistic
Postal / Zip Code51104
Primary CitySioux City
State / ProvinceIA
CountyWoodbury
Total Population23,197
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1,198.1 people/sq mi
TimezoneAmerica/Chicago

How 51104 Compares

MetricZIP 51104Woodbury CountyIA State Average
Population23,19797,439 (Total)3,210,984 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density1,198.1 /sq mi----
County Pop Rank#2 of 20----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 51103Sioux City2.4 mi16,895N/A
Zip 51105Sioux City2.6 mi10,415N/A
Zip 51101Sioux City2.9 mi1,031N/A
Zip 51108Sioux City3.5 mi5,960N/A
Zip 51109Sioux City5.8 mi3,606N/A

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 →