County Maps US

Hamlin County, South Dakota

A county in South Dakota, ranked 27 of 66 by population.

CountyFIPS 46057

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

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Population
6,900
+731 (+11.8%) since 2020
Land area
507.1
square miles. A further 5.8% of the total area is water
Population density
13.6
people per square mile, computed rather than published
County seat
Hayti
Seat of county government.
Established
1873
152 years ago
Largest city
Estelline city
Population 792.

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 Hamlin 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 Hamlin 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 518 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 Hamlin 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
Population6,90027th of 662,663rd of 3,144
Land area507.1 sq mi60th of 662,048th of 3,144
Population density13.6 per sq mi16th of 662,434th of 3,144
Median household income$87,1014th of 66368th of 3,143

Full data for Hamlin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population6,900Vintage 2025 Population Estimates
Population in 20206,169Vintage 2025 Population Estimates
2020 estimates base?6,171Vintage 2025 Population Estimates
Land area507.1 sq mi2025 Gazetteer Files
Water area31.0 sq mi2025 Gazetteer Files
Total area538.1 sq mi2025 Gazetteer Files
Population density?13.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$87,101American Community Survey 2020-2024 5-Year Estimates
Median home value$208,600American Community Survey 2020-2024 5-Year Estimates
Median age31.8American Community Survey 2020-2024 5-Year Estimates
Households2,194American Community Survey 2020-2024 5-Year Estimates
Housing units2,860American 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
+84
146 births, 62 deaths
Net migration
+85
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 Hamlin 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
Codington CountySouth Dakota30 mi29,562
Deuel CountySouth Dakota18 mi4,408
Kingsbury CountySouth Dakota18 mi5,284
Clark CountySouth Dakota18 mi4,031
Brookings CountySouth Dakota12 mi37,635

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.