Zip Code 51108 — Sioux City, IA

ZIP Code 51108 is associated with Sioux City, IA, in Plymouth County. The listed population estimate is 5,960; estimated density is 50.0 people per square mile. Among records with population estimates, it ranks #2 of 11 in Plymouth County and #127 of 969 in IA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (42.566250, -96.348580)

Data MetricLocal Statistic
Postal / Zip Code51108
Primary CitySioux City
State / ProvinceIA
CountyPlymouth
Total Population5,960
Population Density50.0 people/sq mi
TimezoneAmerica/Chicago

How 51108 Compares

MetricZIP 51108Plymouth County recordsIA records
Population estimate5,96034,178 (sum)3,210,984 (sum)
Population Density50.0 /sq mi----
County population rank#2 of 11----
State population rank#127 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 51104Sioux City3.5 mi23,197
ZIP 51105Sioux City4.1 mi10,415
ZIP 51101Sioux City5.5 mi1,031
ZIP 51024Hinton5.6 mi2,081
ZIP 51103Sioux City5.9 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 →