Data / Rankings / Uninsured rate, under 65 (US model-based estimate) / Counties in South Dakota

Counties in South Dakota by uninsured rate, under 65 (US model-based estimate)

Buffalo County had the highest uninsured rate, under 65 (US model-based estimate) of 66 counties in 2021, at 18.6%. Sully County had the lowest, at 7.2%. The median was 12.3% and the figure for South Dakota was 11.5%. Source: the U.S. Census Bureau.

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Highest18.6Buffalo County
Lowest7.2Sully County
Median12.366 counties
South Dakota11.5History

Map of counties, 2021

Aurora County: 13.6 %Beadle County: 14.7 %Bennett County: 17.7 %Bon Homme County: 12.3 %Brookings County: 8.4 %Brown County: 10.7 %Brule County: 13.9 %Buffalo County: 18.6 %Butte County: 13.6 %Campbell County: 9.7 %Charles Mix County: 17.1 %Clark County: 12.2 %Clay County: 13.2 %Codington County: 10.9 %Corson County: 14.6 %Custer County: 13.8 %Davison County: 10.5 %Day County: 15 %Deuel County: 10.3 %Dewey County: 18.4 %Douglas County: 13.7 %Edmunds County: 10.4 %Fall River County: 12.7 %Faulk County: 12.3 %Grant County: 12.5 %Gregory County: 15.6 %Haakon County: 11.4 %Hamlin County: 13.5 %Hand County: 8.8 %Hanson County: 11.9 %Harding County: 13 %Hughes County: 8.9 %Hutchinson County: 12 %Hyde County: 11.5 %Jackson County: 17.8 %Jerauld County: 10.2 %Jones County: 11.1 %Kingsbury County: 11.8 %Lake County: 10.6 %Lawrence County: 12.4 %Lincoln County: 8 %Lyman County: 16.3 %McCook County: 12.9 %McPherson County: 9.9 %Marshall County: 12.1 %Meade County: 9.7 %Mellette County: 16.5 %Miner County: 11.9 %Minnehaha County: 10.9 %Moody County: 13.4 %Oglala Lakota County: 17 %Pennington County: 12.3 %Perkins County: 11.3 %Potter County: 9.5 %Roberts County: 17 %Sanborn County: 11.6 %Spink County: 12.3 %Stanley County: 10.1 %Sully County: 7.2 %Todd County: 15.6 %Tripp County: 16.3 %Turner County: 10.9 %Union County: 8.2 %Walworth County: 12.9 %Yankton County: 11.3 %Ziebach County: 17.1 %
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%, 2021. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Buffalo County: 18.6 %Buffalo County18.6Dewey County: 18.4 %Dewey County18.4Jackson County: 17.8 %Jackson County17.8Bennett County: 17.7 %Bennett County17.7Charles Mix County: 17.1 %Charles Mix County17.1Ziebach County: 17.1 %Ziebach County17.1Oglala Lakota County: 17 %Oglala Lakota County17Roberts County: 17 %Roberts County17Mellette County: 16.5 %Mellette County16.5Lyman County: 16.3 %Lyman County16.3Tripp County: 16.3 %Tripp County16.3Gregory County: 15.6 %Gregory County15.6Todd County: 15.6 %Todd County15.6Day County: 15 %Day County15Beadle County: 14.7 %Beadle County14.7Corson County: 14.6 %Corson County14.6Brule County: 13.9 %Brule County13.9Custer County: 13.8 %Custer County13.8Douglas County: 13.7 %Douglas County13.7Aurora County: 13.6 %Aurora County13.6Butte County: 13.6 %Butte County13.6Hamlin County: 13.5 %Hamlin County13.5Moody County: 13.4 %Moody County13.4Clay County: 13.2 %Clay County13.2Harding County: 13 %Harding County13McCook County: 12.9 %McCook County12.9Walworth County: 12.9 %Walworth County12.9Fall River County: 12.7 %Fall River County12.7Grant County: 12.5 %Grant County12.5Lawrence County: 12.4 %Lawrence County12.4Bon Homme County: 12.3 %Bon Homme County12.3Faulk County: 12.3 %Faulk County12.3Pennington County: 12.3 %Pennington County12.3Spink County: 12.3 %Spink County12.3Clark County: 12.2 %Clark County12.2Marshall County: 12.1 %Marshall County12.1Hutchinson County: 12 %Hutchinson County12Hanson County: 11.9 %Hanson County11.9Miner County: 11.9 %Miner County11.9Kingsbury County: 11.8 %Kingsbury County11.8Buffalo County: 18.6 %Buffalo County18.6Dewey County: 18.4 %Dewey County18.4Jackson County: 17.8 %Jackson County17.8Bennett County: 17.7 %Bennett County17.7Charles Mix County: 17.1 %Charles Mix County17.1Ziebach County: 17.1 %Ziebach County17.1Oglala Lakota County: 17 %Oglala Lakota County17Roberts County: 17 %Roberts County17Mellette County: 16.5 %Mellette County16.5Lyman County: 16.3 %Lyman County16.3Tripp County: 16.3 %Tripp County16.3Gregory County: 15.6 %Gregory County15.6Todd County: 15.6 %Todd County15.6Day County: 15 %Day County15Beadle County: 14.7 %Beadle County14.7Corson County: 14.6 %Corson County14.6Brule County: 13.9 %Brule County13.9Custer County: 13.8 %Custer County13.8Douglas County: 13.7 %Douglas County13.7Aurora County: 13.6 %Aurora County13.6Butte County: 13.6 %Butte County13.6Hamlin County: 13.5 %Hamlin County13.5Moody County: 13.4 %Moody County13.4Clay County: 13.2 %Clay County13.2Harding County: 13 %Harding County13McCook County: 12.9 %McCook County12.9Walworth County: 12.9 %Walworth County12.9Fall River County: 12.7 %Fall River County12.7Grant County: 12.5 %Grant County12.5Lawrence County: 12.4 %Lawrence County12.4Bon Homme County: 12.3 %Bon Homme County12.3Faulk County: 12.3 %Faulk County12.3Pennington County: 12.3 %Pennington County12.3Spink County: 12.3 %Spink County12.3Clark County: 12.2 %Clark County12.2Marshall County: 12.1 %Marshall County12.1Hutchinson County: 12 %Hutchinson County12Hanson County: 11.9 %Hanson County11.9Miner County: 11.9 %Miner County11.9Kingsbury County: 11.8 %Kingsbury County11.8
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Buffalo County18.6-1.2 pts
2Dewey County18.40 pts
3Jackson County17.8+1.1 pts
4Bennett County17.7-1.6 pts
5Charles Mix County17.1-1.4 pts
5Ziebach County17.1+0.6 pts
7Oglala Lakota County17-1.4 pts
7Roberts County17-1.7 pts
9Mellette County16.5-0.1 pts
10Lyman County16.3+0.8 pts
10Tripp County16.3+2.4 pts
12Gregory County15.6+0.4 pts
12Todd County15.6+0.6 pts
14Day County15+2 pts
15Beadle County14.7-0.4 pts
16Corson County14.6+2.1 pts
17Brule County13.9-2 pts
18Custer County13.8-0.3 pts
19Douglas County13.7+1.6 pts
20Aurora County13.60 pts
20Butte County13.6-0.1 pts
22Hamlin County13.5+1.2 pts
23Moody County13.4-1.6 pts
24Clay County13.2+0.9 pts
25Harding County13-1.9 pts
26McCook County12.9+0.9 pts
26Walworth County12.9-1 pts
28Fall River County12.7+0.3 pts
29Grant County12.5-0.9 pts
30Lawrence County12.4-1 pts
31Bon Homme County12.3-0.3 pts
31Faulk County12.3+3.9 pts
31Pennington County12.3-1.2 pts
31Spink County12.3+1.3 pts
35Clark County12.2+0.1 pts
36Marshall County12.1+0.3 pts
37Hutchinson County12+0.8 pts
38Hanson County11.9+2.7 pts
38Miner County11.9+0.6 pts
40Kingsbury County11.8+1.4 pts
41Sanborn County11.6+1.3 pts
42Hyde County11.5+0.6 pts
43Haakon County11.4+1 pts
44Perkins County11.3+2.8 pts
44Yankton County11.3-1.3 pts
46Jones County11.1-2.3 pts
47Codington County10.9-0.3 pts
47Minnehaha County10.9+1.6 pts
47Turner County10.9+0.2 pts
50Brown County10.7-0.7 pts
51Lake County10.6+0.1 pts
52Davison County10.5-1.1 pts
53Edmunds County10.40 pts
54Deuel County10.3+0.3 pts
55Jerauld County10.2+3 pts
56Stanley County10.1+0.3 pts
57McPherson County9.9+0.5 pts
58Campbell County9.7+1.8 pts
58Meade County9.7-1.2 pts
60Potter County9.5-1.6 pts
61Hughes County8.9-3.3 pts
62Hand County8.8-0.5 pts
63Brookings County8.4-0.4 pts
64Union County8.2-0.8 pts
65Lincoln County80 pts
66Sully County7.2-0.4 pts

Other periods

About this ranking

People under 65 without health insurance coverage of any kind, as a percentage of all people under 65. United States: Census Bureau Small Area Health Insurance Estimates (SAHIE) for states and counties, all races, both sexes and all income levels.

A model-based single-year estimate that combines the American Community Survey with administrative records and population estimates, so every county gets a figure. Covers states and counties only, because the SAHIE dataset files have no national row. The Census Bureau advises comparing years from 2008 on only; 2013 is the updated release. People 65 and over are left out because nearly all of them have Medicare.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties (Counties in South Dakota by uninsured rate, under 65 (US model-based estimate), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip

MLA 9

Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties, Counties in South Dakota by uninsured rate, under 65 (US model-based estimate), 2021. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Counties in South Dakota by uninsured rate, under 65 (US model-based estimate), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2021.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties, Counties in South Dakota by uninsured rate, under 65 (US model-based estimate), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2021,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties: Counties in South Dakota by uninsured rate, under 65 (US model-based estimate), 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2021. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties: Counties in South Dakota by uninsured rate, under 65 (US model-based estimate), 2021
PY  - 2026
DA  - 2026/08/06
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest uninsured rate, under 65 (US model-based estimate)?

Buffalo County, with 18.6% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, under 65 (US model-based estimate)?

Sully County, with 7.2% in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, under 65 (US model-based estimate): other rankings

Counties in South Dakota: more rankings