County Maps US

Dewey County, South Dakota

A county in South Dakota, ranked 33 of 66 by population.

CountyFIPS 46041

Within South Dakota
Dewey County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Timber Lake, the county seat, located via the 2025 Census Gazetteer.

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Population
5,419
+196 (+3.8%) since 2020
Land area
2,302
square miles. A further 5.8% of the total area is water
Population density
2.4
people per square mile, computed rather than published
County seat
Timber Lake
Seat of county government.
Established
1883
142 years ago
Largest city
Eagle Butte city
Population 661 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Dewey County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Dewey County, South Dakota from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 695 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Dewey County ranks

Position among the 66 counties of South Dakota, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn South DakotaNationally
Population5,41933rd of 662,786th of 3,144
Land area2,302 sq mi6th of 66242nd of 3,144
Population density2.4 per sq mi50th of 662,954th of 3,144
Median household income$54,10458th of 662,525th of 3,143

Full data for Dewey County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population5,419Vintage 2025 Population Estimates
Population in 20205,223Vintage 2025 Population Estimates
2020 estimates base?5,244Vintage 2025 Population Estimates
Land area2,302 sq mi2025 Gazetteer Files
Water area142.9 sq mi2025 Gazetteer Files
Total area2,445 sq mi2025 Gazetteer Files
Population density?2.4 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$54,104American Community Survey 2020-2024 5-Year Estimates
Median home value$69,600American Community Survey 2020-2024 5-Year Estimates
Median age27.7American Community Survey 2020-2024 5-Year Estimates
Households1,692American Community Survey 2020-2024 5-Year Estimates
Housing units1,931American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+65
127 births, 62 deaths
Net migration
-28
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Dewey County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Ziebach CountySouth Dakota69 mi2,389
Corson CountySouth Dakota55 mi3,781
Potter CountySouth Dakota33 mi2,377
Stanley CountySouth Dakota31 mi3,018
Sully CountySouth Dakota27 mi1,479
Walworth CountySouth Dakota18 mi5,217
Haakon CountySouth Dakotaa single point1,802

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 66 counties of South Dakota

Open the interactive South Dakota county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.