ZIP code · Little Sioux · Iowa · United States
ZIP code 51545 — Little Sioux
ZIP code 51545 serves Little Sioux, Iowa.
- Postal code
- 51545Single source Value from one source, not cross-checked.
- City
- Little Sioux
- County
- Harrison FIPS 19085
- State
- Iowa
- Country
- United States
- Coordinates
- 41.8083, -96.0314 — precision precise (locality)
View on OpenStreetMap - Population
- 258 (ZCTA, ACS 5-year)
- Population density
- 6 / sq mi
- Land area
- 46.5 sq mi (120.3 km²) (ZCTA, ACS 5-year)
- Median household income
- $67,083
- Per-capita income
- $30,402
- Median age
- 58.9
- Households
- 119
- Housing units
- 149
- Median home value
- $81,300
- Median gross rent
- $450 / 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 51545 with another ZIP · ZIPs within 25 miles · distance from 51545
Map of ZIP code 51545
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 | 29 | 34 | 48 | 62 | 73 | 83 | 86 | 83 | 77 | 64 | 48 | 34 |
| Avg low °F | 9 | 13 | 24 | 35 | 48 | 59 | 62 | 60 | 50 | 37 | 24 | 14 |
| Precip in | 0.9 | 1.3 | 2.3 | 3.9 | 5.1 | 5.7 | 4.8 | 4.5 | 5.0 | 2.9 | 1.7 | 1.5 |
NOAA 1991–2020 climate normals from the nearest station: LITTLE SIOUX 2 NW (1.6 mi) · NOAA NCEI
Places in ZIP 51545
- 3 parks
- 1 playgrounds
- 1 post offices
- 1 places of worship
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