Data / Rankings / Uninsured rate, ages 18 to 64 (US model-based estimate) / Counties in South Dakota

Counties in South Dakota by uninsured rate, ages 18 to 64 (US model-based estimate)

Buffalo County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 66 counties in 2020, at 27.8%. Sully County had the lowest, at 8.3%. The median was 14.1% and the figure for South Dakota was 13.9%. Source: the U.S. Census Bureau.

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Highest27.8Buffalo County
Lowest8.3Sully County
Median14.166 counties
South Dakota13.9History

Map of counties, 2020

Aurora County: 15.4 %Beadle County: 18.6 %Bennett County: 25.7 %Bon Homme County: 14.6 %Brookings County: 10.3 %Brown County: 13.6 %Brule County: 18.3 %Buffalo County: 27.8 %Butte County: 16.6 %Campbell County: 8.7 %Charles Mix County: 22.9 %Clark County: 14.2 %Clay County: 14.3 %Codington County: 13.3 %Corson County: 18.2 %Custer County: 15.4 %Davison County: 14.1 %Day County: 14.9 %Deuel County: 11 %Dewey County: 25.7 %Douglas County: 13.5 %Edmunds County: 11.6 %Fall River County: 14.1 %Faulk County: 10.2 %Grant County: 15.2 %Gregory County: 17.9 %Haakon County: 11.4 %Hamlin County: 14.4 %Hand County: 9.7 %Hanson County: 10.6 %Harding County: 16.5 %Hughes County: 14.5 %Hutchinson County: 12.9 %Hyde County: 11.9 %Jackson County: 23.1 %Jerauld County: 8.3 %Jones County: 15.2 %Kingsbury County: 11.7 %Lake County: 12 %Lawrence County: 15.5 %Lincoln County: 9.6 %Lyman County: 18.6 %McCook County: 13.5 %McPherson County: 11.5 %Marshall County: 13.2 %Meade County: 12.8 %Mellette County: 22.5 %Miner County: 12.8 %Minnehaha County: 11.1 %Moody County: 16.8 %Oglala Lakota County: 26.2 %Pennington County: 16.6 %Perkins County: 10.1 %Potter County: 12 %Roberts County: 22.6 %Sanborn County: 11.5 %Spink County: 12.5 %Stanley County: 11.3 %Sully County: 8.3 %Todd County: 23.4 %Tripp County: 16.7 %Turner County: 12.1 %Union County: 10.1 %Walworth County: 16.7 %Yankton County: 14.5 %Ziebach County: 20.9 %
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%, 2020. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2020

Buffalo County: 27.8 %Buffalo County27.8Oglala Lakota County: 26.2 %Oglala Lakota County26.2Bennett County: 25.7 %Bennett County25.7Dewey County: 25.7 %Dewey County25.7Todd County: 23.4 %Todd County23.4Jackson County: 23.1 %Jackson County23.1Charles Mix County: 22.9 %Charles Mix County22.9Roberts County: 22.6 %Roberts County22.6Mellette County: 22.5 %Mellette County22.5Ziebach County: 20.9 %Ziebach County20.9Beadle County: 18.6 %Beadle County18.6Lyman County: 18.6 %Lyman County18.6Brule County: 18.3 %Brule County18.3Corson County: 18.2 %Corson County18.2Gregory County: 17.9 %Gregory County17.9Moody County: 16.8 %Moody County16.8Tripp County: 16.7 %Tripp County16.7Walworth County: 16.7 %Walworth County16.7Butte County: 16.6 %Butte County16.6Pennington County: 16.6 %Pennington County16.6Harding County: 16.5 %Harding County16.5Lawrence County: 15.5 %Lawrence County15.5Aurora County: 15.4 %Aurora County15.4Custer County: 15.4 %Custer County15.4Grant County: 15.2 %Grant County15.2Jones County: 15.2 %Jones County15.2Day County: 14.9 %Day County14.9Bon Homme County: 14.6 %Bon Homme County14.6Hughes County: 14.5 %Hughes County14.5Yankton County: 14.5 %Yankton County14.5Hamlin County: 14.4 %Hamlin County14.4Clay County: 14.3 %Clay County14.3Clark County: 14.2 %Clark County14.2Davison County: 14.1 %Davison County14.1Fall River County: 14.1 %Fall River County14.1Brown County: 13.6 %Brown County13.6Douglas County: 13.5 %Douglas County13.5McCook County: 13.5 %McCook County13.5Codington County: 13.3 %Codington County13.3Marshall County: 13.2 %Marshall County13.2Buffalo County: 27.8 %Buffalo County27.8Oglala Lakota County: 26.2 %Oglala Lakota County26.2Bennett County: 25.7 %Bennett County25.7Dewey County: 25.7 %Dewey County25.7Todd County: 23.4 %Todd County23.4Jackson County: 23.1 %Jackson County23.1Charles Mix County: 22.9 %Charles Mix County22.9Roberts County: 22.6 %Roberts County22.6Mellette County: 22.5 %Mellette County22.5Ziebach County: 20.9 %Ziebach County20.9Beadle County: 18.6 %Beadle County18.6Lyman County: 18.6 %Lyman County18.6Brule County: 18.3 %Brule County18.3Corson County: 18.2 %Corson County18.2Gregory County: 17.9 %Gregory County17.9Moody County: 16.8 %Moody County16.8Tripp County: 16.7 %Tripp County16.7Walworth County: 16.7 %Walworth County16.7Butte County: 16.6 %Butte County16.6Pennington County: 16.6 %Pennington County16.6Harding County: 16.5 %Harding County16.5Lawrence County: 15.5 %Lawrence County15.5Aurora County: 15.4 %Aurora County15.4Custer County: 15.4 %Custer County15.4Grant County: 15.2 %Grant County15.2Jones County: 15.2 %Jones County15.2Day County: 14.9 %Day County14.9Bon Homme County: 14.6 %Bon Homme County14.6Hughes County: 14.5 %Hughes County14.5Yankton County: 14.5 %Yankton County14.5Hamlin County: 14.4 %Hamlin County14.4Clay County: 14.3 %Clay County14.3Clark County: 14.2 %Clark County14.2Davison County: 14.1 %Davison County14.1Fall River County: 14.1 %Fall River County14.1Brown County: 13.6 %Brown County13.6Douglas County: 13.5 %Douglas County13.5McCook County: 13.5 %McCook County13.5Codington County: 13.3 %Codington County13.3Marshall County: 13.2 %Marshall County13.2
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Buffalo County27.8+1.7 pts
2Oglala Lakota County26.2+2.2 pts
3Bennett County25.7-3.2 pts
3Dewey County25.7-2.4 pts
5Todd County23.4-4.4 pts
6Jackson County23.1-9.1 pts
7Charles Mix County22.9+0.3 pts
8Roberts County22.6+0.2 pts
9Mellette County22.5-6.2 pts
10Ziebach County20.9-4 pts
11Beadle County18.6-0.7 pts
11Lyman County18.6-1.6 pts
13Brule County18.3-1 pts
14Corson County18.2-8.8 pts
15Gregory County17.9-1 pts
16Moody County16.8+0.9 pts
17Tripp County16.7-3.7 pts
17Walworth County16.7-0.1 pts
19Butte County16.6-2.1 pts
19Pennington County16.6+1.3 pts
21Harding County16.5-4 pts
22Lawrence County15.5+2 pts
23Aurora County15.4-3.7 pts
23Custer County15.4+1.8 pts
25Grant County15.2+2.4 pts
25Jones County15.2-1.3 pts
27Day County14.9-2.1 pts
28Bon Homme County14.6+0.5 pts
29Hughes County14.5+2.1 pts
29Yankton County14.5+1.7 pts
31Hamlin County14.4+0.3 pts
32Clay County14.3+1.9 pts
33Clark County14.2+0.2 pts
34Davison County14.1+2.2 pts
34Fall River County14.1-0.6 pts
36Brown County13.6-0.8 pts
37Douglas County13.5-2.2 pts
37McCook County13.5-0.6 pts
39Codington County13.3+1.2 pts
40Marshall County13.2-3.4 pts
41Hutchinson County12.9-1.8 pts
42Meade County12.8+1 pts
42Miner County12.8-0.1 pts
44Spink County12.5+0.1 pts
45Turner County12.1+0.1 pts
46Lake County12+2.2 pts
46Potter County12-0.1 pts
48Hyde County11.9-5.2 pts
49Kingsbury County11.7+0.2 pts
50Edmunds County11.6-0.5 pts
51McPherson County11.5-2.7 pts
51Sanborn County11.5-1 pts
53Haakon County11.4-3.4 pts
54Stanley County11.3-1.4 pts
55Minnehaha County11.1-1.7 pts
56Deuel County11-2 pts
57Hanson County10.6-0.8 pts
58Brookings County10.3-0.7 pts
59Faulk County10.2-5.2 pts
60Perkins County10.1-7.2 pts
60Union County10.1+1 pts
62Hand County9.7-1.6 pts
63Lincoln County9.6+1.3 pts
64Campbell County8.7-3.1 pts
65Jerauld County8.3-4.2 pts
65Sully County8.3-2.3 pts

Other periods

About this ranking

People aged 18 to 64 without health insurance coverage of any kind, as a percentage of all people aged 18 to 64. 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. Working-age adults; the rate for everyone under 65 is uninsured_rate_under_65.

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, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-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, ages 18 to 64, all races, both sexes, all income levels, states and counties (Counties in South Dakota by uninsured rate, ages 18 to 64 (US model-based estimate), 2020) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip

MLA 9

Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in South Dakota by uninsured rate, ages 18 to 64 (US model-based estimate), 2020. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/south-dakota-counties?period=2020. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Counties in South Dakota by uninsured rate, ages 18 to 64 (US model-based estimate), 2020. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/south-dakota-counties?period=2020.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in South Dakota by uninsured rate, ages 18 to 64 (US model-based estimate), 2020 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/south-dakota-counties?period=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2020,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in South Dakota by uninsured rate, ages 18 to 64 (US model-based estimate), 2020}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/south-dakota-counties?period=2020. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in South Dakota by uninsured rate, ages 18 to 64 (US model-based estimate), 2020
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-2020-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/south-dakota-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/south-dakota-counties?period=2020.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest uninsured rate, ages 18 to 64 (US model-based estimate)?

Buffalo County, with 27.8% in 2020, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 18 to 64 (US model-based estimate)?

Sully County, with 8.3% in 2020.

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, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, ages 18 to 64 (US model-based estimate): other rankings

Counties in South Dakota: more rankings