Dewey County, South Dakota ZIP codes
7 ZIP codes are in Dewey County, plus 3 that cross in from neighboring counties.
- ZIP codes
- 7
- Population in these ZIPs
- 8,754
- Avg. median income
- $55,100population-weighted
- Cities & towns
- 7
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ZIP codes in Dewey County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 57601 | Mobridge | 3,422 | $66,003 | $129,000 |
| 57625 | Eagle Butte | 3,775 | $43,235 | $68,000 |
| 57630 | Glencross | 11 | — | — |
| 57636 | Lantry | 104 | $112,375 | $108,800 |
| 57652 | Ridgeview | 265 | $19,327 | — |
| 57656 | Timber Lake | 1,000 | $66,094 | $86,300 |
| 57661 | Whitehorse | 177 | $55,000 | — |
ZIP codes partly in Dewey County
These ZIP codes are mostly in a neighboring county but cover part of Dewey County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 57442 | Gettysburg | Potter County | 1,772 | $65,625 | $170,300 |
| 57633 | Isabel | Corson County | 445 | $78,750 | $70,000 |
| 57657 | Trail City | Corson County | 247 | — | $57,100 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Dewey County
Nearby counties
Frequently asked questions
How many ZIP codes are in Dewey County, South Dakota?
7 ZIP codes are mainly in Dewey County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in Dewey County?
ZIP codes in Dewey County use the city names Eagle Butte, Glencross, Lantry, Mobridge, Ridgeview, Timber Lake and Whitehorse.