ZIP code · Erwin · South Dakota · United States
ZIP code 57233 — Erwin
ZIP code 57233 serves Erwin, South Dakota.
- Postal code
- 57233Single source Value from one source, not cross-checked.
- City
- Erwin
- County
- Kingsbury FIPS 46077
- State
- South Dakota
- Country
- United States
- Coordinates
- 44.4915, -97.4103 — precision precise (locality)
View on OpenStreetMap - Population
- 240 (ZCTA, ACS 5-year)
- Population density
- 7 / sq mi
- Land area
- 36.7 sq mi (95.1 km²) (ZCTA, ACS 5-year)
- Median household income
- $89,375
- Per-capita income
- $24,858
- Median age
- 19.7
- Households
- 49
- Housing units
- 66
- Median home value
- $280,000
- 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 57233 with another ZIP · ZIPs within 25 miles · distance from 57233
Map of ZIP code 57233
Climate — monthly normals
Warmest month Jul (avg high 82°F), coldest Jan (avg low 5°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 23 | 29 | 41 | 55 | 67 | 77 | 82 | 79 | 72 | 57 | 41 | 28 |
| Avg low °F | 5 | 9 | 21 | 33 | 45 | 56 | 61 | 59 | 50 | 36 | 22 | 10 |
| Precip in | 0.6 | 0.9 | 1.4 | 2.3 | 3.3 | 4.1 | 3.9 | 3.1 | 2.8 | 2.0 | 1.0 | 0.7 |
NOAA 1991–2020 climate normals from the nearest station: DE SMET (10.2 mi) · NOAA NCEI
Places in ZIP 57233
- 1 parks
- 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