Dewey County
- Population
- 4,360
- Area
- 1 sq mi (2.59 km²), 0.01 sq mi water
- Median age
- 38.5
- Households
- 1,631
- Persons per household
- 2.6
- Median household income
- $62,569
- Median house value
- $133,600
Demographics: 2020–2024 ACS
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