ZIP Code 51101 — Sioux City city, IA Demographics & Data

ZIP code 51101 covers Sioux City, IA in Woodbury County with a population of about 1,077.

At a glance, the area shows median age of 33.8 versus a U.S. median of about 38.9.

It sits in telephone area code 712; U.S. House district IA-4; the SIOUX CITY media market.

Sioux City, IA is tagged as a Tribal Nation community context (place names indicate a tribal nation community). Local search often includes tribal government offices, public safety, and Indian Health Service (IHS) / wellness topics alongside standard ZIP demographics.

Median household income in ZIP 51101 is about $18,103 — about 76% below the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 41.9%; unemployment rate near 13.8%; 11.1% of adults with a bachelor’s degree or higher (about 22.6 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Food services, Construction, and Manufacturing; a mean commute of about 180.0 minutes (U.S. average near 26.8).

Housing tenure and rents show median gross rent around $663 (about 43% below the U.S. median rent ($1,163)), and owner-occupancy near 1.2% (about 64.2 points below the national owner-occupancy rate (65.4%)).

FEMA’s National Risk Index rates natural-hazard risk for Sioux City city, IA as Relatively Moderate (composite score 83.3), which is elevated versus much of the country. The strongest component scores on US5 are wildfire (87.4) and flood (78.2). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Climate normals for Sioux City city, IA show little to no average snow and around 30.3 inches of annual precipitation.

IRS migration statistics show a net inflow of about 62 for ZIP 51101 (Sioux City city, IA) on US5’s published series — a signal of people/tax filers moving in relative to those leaving. Inflows often track job growth, housing demand, or lifestyle migration; treat the figure as a directional indicator rather than a precise headcount.