County Maps US

Roberts County, South Dakota

A county in South Dakota, ranked 18 of 66 by population.

CountyFIPS 46109

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

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Population
10,255
-11 (-0.1%) since 2020
Land area
1,101
square miles. A further 3.1% of the total area is water
Population density
9.3
people per square mile, computed rather than published
County seat
Sisseton
Seat of county government.
Established
1883
142 years ago
Largest city
Sisseton city
Population 2,413.

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 Roberts 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 Roberts 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 678 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 Roberts 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
Population10,25518th of 662,388th of 3,144
Land area1,101 sq mi26th of 66578th of 3,144
Population density9.3 per sq mi21st of 662,587th of 3,144
Median household income$65,13049th of 661,622nd of 3,143

Full data for Roberts County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population10,255Vintage 2025 Population Estimates
Population in 202010,266Vintage 2025 Population Estimates
2020 estimates base?10,284Vintage 2025 Population Estimates
Land area1,101 sq mi2025 Gazetteer Files
Water area34.7 sq mi2025 Gazetteer Files
Total area1,136 sq mi2025 Gazetteer Files
Population density?9.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$65,130American Community Survey 2020-2024 5-Year Estimates
Median home value$154,500American Community Survey 2020-2024 5-Year Estimates
Median age38.5American Community Survey 2020-2024 5-Year Estimates
Households3,625American Community Survey 2020-2024 5-Year Estimates
Housing units4,848American 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
+45
143 births, 98 deaths
Net migration
-67
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 Roberts 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
Grant CountySouth Dakota38 mi7,534
Richland CountyNorth Dakota32 mi16,731
Traverse CountyMinnesota31 mi3,130
Big Stone CountyMinnesota27 mi5,054
Marshall CountySouth Dakota26 mi4,426
Day CountySouth Dakota18 mi5,484
Sargent CountyNorth Dakotaa single point3,711

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.