County Maps US

Codington County, South Dakota

A county in South Dakota, ranked 7 of 66 by population.

CountyFIPS 46029

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

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Population
29,562
+1,209 (+4.3%) since 2020
Land area
687.6
square miles. A further 4.1% of the total area is water
Population density
43.0
people per square mile, computed rather than published
County seat
Watertown
Seat of county government.
Established
1877
148 years ago
Largest city
Watertown city
Population 23,736.

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 Codington 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 Codington 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 660 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 Codington 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
Population29,5627th of 661,459th of 3,144
Land area687.6 sq mi47th of 661,363rd of 3,144
Population density43.0 per sq mi6th of 661,605th of 3,144
Median household income$72,72733rd of 66998th of 3,143

Full data for Codington County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population29,562Vintage 2025 Population Estimates
Population in 202028,353Vintage 2025 Population Estimates
2020 estimates base?28,322Vintage 2025 Population Estimates
Land area687.6 sq mi2025 Gazetteer Files
Water area29.6 sq mi2025 Gazetteer Files
Total area717.2 sq mi2025 Gazetteer Files
Population density?43.0 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$72,727American Community Survey 2020-2024 5-Year Estimates
Median home value$237,700American Community Survey 2020-2024 5-Year Estimates
Median age40.4American Community Survey 2020-2024 5-Year Estimates
Households12,526American Community Survey 2020-2024 5-Year Estimates
Housing units13,533American 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
+18
317 births, 299 deaths
Net migration
+274
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 5 areas bordering Codington 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
Hamlin CountySouth Dakota30 mi6,900
Grant CountySouth Dakota29 mi7,534
Clark CountySouth Dakota24 mi4,031
Day CountySouth Dakota13 mi5,484
Deuel CountySouth Dakota12 mi4,408

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.