County ProfileSD
Dewey County
Population: 5,239 · 7 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
5,239
People
Median age
27.7
Housing
Total households
1,692
Income
Median household income
$54,104
Housing
Total housing units
1,931
Employment
Employment rate
53%
Education
Bachelor’s degree or higher
18.8%
Healthcare
Insured population
78.8%
County details
Local time 02:25:09(CT)| Name | Dewey |
|---|---|
| Total ZIP codes | 7total |
| ZIP codes (by type) | 5 Standard2 PO Box |
| Area code | 605 |
| Timezone | Central Time (CT) |
| Coordinates | 45.148049, -100.8379534 |
| Land area | 2,302.4 sq miles(5,963.1 km²) |
Map of Dewey county, South Dakota with ZIP codes
Cities and Communities in Dewey County
Compare the largest cities in Dewey County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Eagle Butte | 1,258 | $45,741 | 1ZIPs |
| Timber Lake | 509 | $60,694 | 1ZIPs |
| Ridgeview | 293 | — | 1ZIPs |
| Isabel | 145 | $68,750 | 1ZIPs |
| Whitehorse | 106 | $59,250 | 1ZIPs |
| Glencross | 46 | — | 1ZIPs |
| Lantry | 33 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Dewey County
Review the most populated postal areas across Dewey County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 57625 | Eagle Butte | $43,235 | 4,029 |
| 57656 | Timber Lake | $66,094 | 766 |
| 57633 | Isabel | $78,750 | 404 |
| 57652 | Ridgeview | $19,327 | 293 |
| 57661 | Whitehorse | $55,000 | 124 |
| 57636 | Lantry | $112,375 | 118 |
| 57630 | Glencross | — | 46 |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS