County Maps US

Brown County, South Dakota

A county in South Dakota, ranked 5 of 66 by population.

CountyFIPS 46013

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

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Population
37,561
-669 (-1.7%) since 2020
Land area
1,713
square miles. A further 1.0% of the total area is water
Population density
21.9
people per square mile, computed rather than published
County seat
Aberdeen
Seat of county government.
Established
1881
144 years ago
Largest city
Aberdeen city
Population 27,961.

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 Brown 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 Brown 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 620 by 800 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 Brown 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
Population37,5615th of 661,253rd of 3,144
Land area1,713 sq mi13th of 66349th of 3,144
Population density21.9 per sq mi12th of 662,177th of 3,144
Median household income$70,89836th of 661,133rd of 3,143

Full data for Brown County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population37,561Vintage 2025 Population Estimates
Population in 202038,230Vintage 2025 Population Estimates
2020 estimates base?38,302Vintage 2025 Population Estimates
Land area1,713 sq mi2025 Gazetteer Files
Water area17.9 sq mi2025 Gazetteer Files
Total area1,731 sq mi2025 Gazetteer Files
Population density?21.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$70,898American Community Survey 2020-2024 5-Year Estimates
Median home value$221,100American Community Survey 2020-2024 5-Year Estimates
Median age37.8American Community Survey 2020-2024 5-Year Estimates
Households16,285American Community Survey 2020-2024 5-Year Estimates
Housing units18,090American 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
+15
411 births, 396 deaths
Net migration
-79
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 8 areas bordering Brown 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
Spink CountySouth Dakota36 mi6,155
Dickey CountyNorth Dakota35 mi4,895
Edmunds CountySouth Dakota24 mi4,022
Day CountySouth Dakota24 mi5,484
McPherson CountySouth Dakota24 mi2,347
Marshall CountySouth Dakota24 mi4,426
Sargent CountyNorth Dakota1.4 mi3,711
Faulk CountySouth Dakota0.2 mi2,178

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.