County Maps US

Bon Homme County, South Dakota

A county in South Dakota, ranked 26 of 66 by population.

CountyFIPS 46009

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

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Population
7,244
+263 (+3.8%) since 2020
Land area
563.5
square miles. A further 3.1% of the total area is water
Population density
12.9
people per square mile, computed rather than published
County seat
Tyndall
Seat of county government.
Established
1862
163 years ago
Largest city
Springfield city
Population 1,926.

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 Bon Homme 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 Bon Homme 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 763 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 Bon Homme 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
Population7,24426th of 662,641st of 3,144
Land area563.5 sq mi55th of 661,827th of 3,144
Population density12.9 per sq mi17th of 662,464th of 3,144
Median household income$64,43552nd of 661,675th of 3,143

Full data for Bon Homme County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population7,244Vintage 2025 Population Estimates
Population in 20206,981Vintage 2025 Population Estimates
2020 estimates base?7,002Vintage 2025 Population Estimates
Land area563.5 sq mi2025 Gazetteer Files
Water area18.1 sq mi2025 Gazetteer Files
Total area581.6 sq mi2025 Gazetteer Files
Population density?12.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$64,435American Community Survey 2020-2024 5-Year Estimates
Median home value$134,100American Community Survey 2020-2024 5-Year Estimates
Median age42.1American Community Survey 2020-2024 5-Year Estimates
Households2,418American Community Survey 2020-2024 5-Year Estimates
Housing units2,842American 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
+21
81 births, 60 deaths
Net migration
+71
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 4 areas bordering Bon Homme 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
Charles Mix CountySouth Dakota41 mi9,303
Knox CountyNebraska33 mi8,335
Hutchinson CountySouth Dakota22 mi7,413
Yankton CountySouth Dakota22 mi23,635

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.