County Maps US

Sanborn County, South Dakota

A county in South Dakota, ranked 53 of 66 by population.

CountyFIPS 46111

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

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Population
2,388
+58 (+2.5%) since 2020
Land area
569.2
square miles. A further 0.2% of the total area is water
Population density
4.2
people per square mile, computed rather than published
County seat
Woonsocket
Seat of county government.
Established
1883
142 years ago
Largest city
Woonsocket city
Population 649.

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 Sanborn 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 Sanborn 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 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 Sanborn 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
Population2,38853rd of 663,008th of 3,144
Land area569.2 sq mi54th of 661,790th of 3,144
Population density4.2 per sq mi39th of 662,810th of 3,144
Median household income$78,75013th of 66636th of 3,143

Full data for Sanborn County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population2,388Vintage 2025 Population Estimates
Population in 20202,330Vintage 2025 Population Estimates
2020 estimates base?2,335Vintage 2025 Population Estimates
Land area569.2 sq mi2025 Gazetteer Files
Water area1.2 sq mi2025 Gazetteer Files
Total area570.5 sq mi2025 Gazetteer Files
Population density?4.2 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$78,750American Community Survey 2020-2024 5-Year Estimates
Median home value$135,600American Community Survey 2020-2024 5-Year Estimates
Median age40.1American Community Survey 2020-2024 5-Year Estimates
Households946American Community Survey 2020-2024 5-Year Estimates
Housing units1,168American 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
-3
27 births, 30 deaths
Net migration
+13
More people moved in than moved out.

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

The 7 areas bordering Sanborn 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
Miner CountySouth Dakota24 mi2,281
Beadle CountySouth Dakota24 mi19,624
Davison CountySouth Dakota18 mi20,069
Jerauld CountySouth Dakota18 mi1,654
Aurora CountySouth Dakota6.3 mi2,801
Hanson CountySouth Dakota5.8 mi3,456
Kingsbury CountySouth Dakota0.2 mi5,284

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.