ZIP code · Westport · South Dakota · United States
ZIP code 57481 — Westport
ZIP code 57481 serves Westport, South Dakota.
- Postal code
- 57481Single source Value from one source, not cross-checked.
- City
- Westport
- County
- Brown FIPS 46013
- State
- South Dakota
- Country
- United States
- Coordinates
- 45.6705, -98.5802 — precision precise (locality)
View on OpenStreetMap - Population
- 361 (ZCTA, ACS 5-year)
- Population density
- 2 / sq mi
- Land area
- 188.5 sq mi (488.2 km²) (ZCTA, ACS 5-year)
- Median household income
- $66,000
- Per-capita income
- $37,229
- Median age
- 45.6
- Households
- 150
- Housing units
- 178
- Median home value
- $201,000
- Congressional district
- SD At-large (119th Congress)
- USDA hardiness zone
- 4b (-25 to -20 °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
- 605 (from the nearest rate centre)Telephone 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 57481 with another ZIP · ZIPs within 25 miles · distance from 57481
Map of ZIP code 57481
Climate — monthly normals
Warmest month Jul (avg high 83°F), coldest Jan (avg low 0°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 22 | 26 | 39 | 55 | 68 | 78 | 83 | 81 | 73 | 58 | 41 | 27 |
| Avg low °F | 0 | 5 | 18 | 31 | 45 | 56 | 60 | 57 | 47 | 33 | 19 | 7 |
| Precip in | 0.5 | 0.4 | 0.9 | 1.8 | 3.4 | 3.6 | 3.6 | 2.6 | 2.4 | 2.1 | 0.7 | 0.5 |
NOAA 1991–2020 climate normals from the nearest station: COLUMBIA 8 N (13.9 mi) · NOAA NCEI
Places in ZIP 57481
- 1 bars & pubs
- 2 parks
- 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