Dewey County, South Dakota
Dewey County, South Dakota, has 5,419 residents (July 2025 estimate). Its county seat is Timber Lake. It uses Mountain Time and covers 2,302 sq mi (5,963 km²) of land.
- Resident population, July 2025
- 5,419
- Land area
- 2,302 sq mi (5,963 km²)
- County seat or government
- Timber Lake
- Time zone
- Mountain TimeUTC-07:00 in January; UTC-06:00 in July
- Median household income
- $54,104 ± $5,497
- Median home value
- $69,600 ± $16,820
- Median rent, with utilities
- $692 ± $63
- Homes lived in by their owners
- 61.2% ± 4.8 points
- County type
- County
- Metro or micro area
- Outside any metro or micro areaNext to: Pierre, SD micro area
- Water area
- 143 sq mi (370 km²)
- State
- South Dakota
- County code (FIPS)
- 46041
- Coordinates (central point)
- 45.148049, -100.837953
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Dewey County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Mountain TimeAmerica/Denver | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 576253,775 people
- 576013,422 people
- 574421,772 people
- 576561,000 people
- 57633445 people
- 57652265 people
- 57657247 people
- 57661177 people
- 57636104 people
- 5763011 people
10 ZIP Code areas overlap Dewey County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Dewey County, largest first
- Eagle Butte School District 20-14,187 people
- Timber Lake School District 20-31,694 people
- Dupree School District 64-21,656 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Tribal areas in Dewey County, largest first
American Indian, Alaska Native and Native Hawaiian areas as the Census Bureau maps them, with at least 2% of their area here, water included. These lines don’t decide membership, jurisdiction or land status.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- North Eagle Butte, South Dakota (CDP)1,481 people
- Eagle Butte, South Dakota (city)1,458 people
- Timber Lake, South Dakota (city)779 people
- La Plant, South Dakota (CDP)240 people
- Isabel, South Dakota (town)214 people
- Whitehorse, South Dakota (CDP)162 people
- Green Grass, South Dakota (CDP)78 people
- Swift Bird, South Dakota (CDP)35 people
- Lantry, South Dakota (CDP)3 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Corson County, South Dakota41 mi northwest
- Ziebach County, South Dakota42 mi west
- Potter County, South Dakota43 mi east
- Walworth County, South Dakota44 mi northeast
- Sully County, South Dakota45 mi southeast
- Stanley County, South Dakota51 mi south
- Haakon County, South Dakota69 mi southwest
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
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