ZIP code · Sioux City · Iowa · United States
ZIP code 51104 — Sioux City
ZIP code 51104 serves Sioux City, Iowa.
- Postal code
- 51104Single source Value from one source, not cross-checked.
- City
- Sioux City
- County
- Woodbury FIPS 19193
- State
- Iowa
- Country
- United States
- Coordinates
- 42.5254, -96.4005 — precision precise (locality)
View on OpenStreetMap - Population
- 22,792 (ZCTA, ACS 5-year)
- Population density
- 3,049 / sq mi
- Land area
- 7.5 sq mi (19.4 km²) (ZCTA, ACS 5-year)
- Median household income
- $74,984
- Per-capita income
- $36,719
- Median age
- 37
- Households
- 8,679
- Housing units
- 9,119
- Median home value
- $193,000
- Median gross rent
- $955 / month
- Congressional district
- IA-4 (119th Congress)
- USDA hardiness zone
- 5a (-20 to -15 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Chicago (UTC−6 / UTC−5 DST)
- Area code
- 712Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 51104 with another ZIP · ZIPs within 25 miles · distance from 51104
Map of ZIP code 51104
Climate — monthly normals
Warmest month Jul (avg high 86°F), coldest Jan (avg low 9°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 35 | 47 | 61 | 72 | 82 | 86 | 83 | 77 | 64 | 47 | 34 |
| Avg low °F | 9 | 13 | 24 | 35 | 47 | 58 | 63 | 61 | 51 | 37 | 24 | 14 |
| Precip in | 0.7 | 0.9 | 1.6 | 3.1 | 4.4 | 4.6 | 3.4 | 3.9 | 3.0 | 2.4 | 1.4 | 1.0 |
NOAA 1991–2020 climate normals from the nearest station: SIOUX CITY ANG (9.0 mi) · NOAA NCEI
Places in ZIP 51104
- 6 schools
- 2 colleges & universities
- 2 hospitals & clinics
- 7 doctors & dentists
- 3 pharmacies
- 5 supermarkets
- 26 restaurants & cafés
- 1 bars & pubs
- 8 parks
- 7 playgrounds
- 1 libraries
- 23 places of worship
- 10 banks
- 6 gas stations
- 1 EV charging stations
- 2 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page