Dewey County ZIP Codes
South Dakota, United States · 7 codes
Dewey County in South Dakota has 7 ZIP codes, from 57625 to 57661, serving 7 places.
ZIP codes in Dewey
Frequently asked questions
What is the ZIP code of Dewey?
Dewey has 7 ZIP codes, from 57625 to 57661. The table lists the places each one serves.
How many places are listed in Dewey County?
7 places.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.