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Zip Code 51106 — Sioux City, IA

51106 is a ZIP Code associated with Sioux City, IA, located within Woodbury. 51106 ranks #1 out of 20 ZIP codes in Woodbury County by population (and #27 out of 970 in IA). The area supports an estimated population of 28,592 residents across Data Pending housing units, with a population density of 329.6 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (42.462920, -96.320000)

Data MetricLocal Statistic
Postal / Zip Code51106
Primary CitySioux City
State / ProvinceIA
CountyWoodbury
Total Population28,592
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density329.6 people/sq mi
TimezoneAmerica/Chicago

How 51106 Compares

MetricZIP 51106Woodbury CountyIA State Average
Population28,59297,439 (Total)3,210,984 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density329.6 /sq mi----
County Pop Rank#1 of 20----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 51105Sioux City3.9 mi10,415N/A
Zip 51101Sioux City4.3 mi1,031N/A
Zip 51111Sioux City4.9 mi39N/A
Zip 51054Sergeant Bluff5.9 mi5,583N/A
Zip 51104Sioux City6.6 mi23,197N/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 →