Zip Code 51105 — Sioux City, IA

ZIP Code 51105 is associated with Sioux City, IA, in Woodbury County. The listed population estimate is 10,415; estimated density is 675.6 people per square mile. Among records with population estimates, it ranks #4 of 20 in Woodbury County and #76 of 969 in IA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (42.508080, -96.367100)

Data MetricLocal Statistic
Postal / Zip Code51105
Primary CitySioux City
State / ProvinceIA
CountyWoodbury
Total Population10,415
Population Density675.6 people/sq mi
TimezoneAmerica/Chicago

How 51105 Compares

MetricZIP 51105Woodbury County recordsIA records
Population estimate10,41597,439 (sum)3,210,984 (sum)
Population Density675.6 /sq mi----
County population rank#4 of 20----
State population rank#76 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 51101Sioux City1.7 mi1,031
ZIP 51104Sioux City2.6 mi23,197
ZIP 51106Sioux City3.9 mi28,592
ZIP 51108Sioux City4.1 mi5,960
ZIP 51103Sioux City4.1 mi16,895

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 →