US location post office
ZIP Code 57233
- Zip Code: 57233
- Type: Standard
- Official USPS city name: Erwin
- Official USPS State Code: SD
- Official State Name: South Dakota
- ZCTA: TRUE
- Population: 139.0
- Density: 1.6
- Primary Official County Code: 46077
- Primary Official County Name: Kingsbury
- Official County Name: Kingsbury
- Official County Code: 46077
- Imprecise: FALSE
- Military: FALSE
- Timezone: America/Chicago (23:31 PM Friday, May 10 2024-05-10 (GMT -0500))
- Geo Point: 44.51193, -97.39821
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