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)

Jackson County had the highest uninsured rate, under 65 (US model-based estimate) of 66 counties in 2018, at 21.9%. Lincoln County had the lowest, at 6.4%. The median was 11.7% and the figure for South Dakota was 11.2%. Source: the U.S. Census Bureau.

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Highest21.9Jackson County
Lowest6.4Lincoln County
Median11.766 counties
South Dakota11.2History

Map of counties, 2018

Aurora County: 15.6 %Beadle County: 15.2 %Bennett County: 20.1 %Bon Homme County: 11.1 %Brookings County: 9.1 %Brown County: 10.5 %Brule County: 16.5 %Buffalo County: 18.9 %Butte County: 13.2 %Campbell County: 10.7 %Charles Mix County: 17 %Clark County: 13 %Clay County: 9.9 %Codington County: 8.9 %Corson County: 20.8 %Custer County: 12.3 %Davison County: 9.8 %Day County: 14.1 %Deuel County: 10.6 %Dewey County: 18.4 %Douglas County: 14.6 %Edmunds County: 10.7 %Fall River County: 11.1 %Faulk County: 11.1 %Grant County: 11.3 %Gregory County: 16.1 %Haakon County: 10.8 %Hamlin County: 9.7 %Hand County: 11.3 %Hanson County: 10.6 %Harding County: 11.5 %Hughes County: 10.2 %Hutchinson County: 12.3 %Hyde County: 12.6 %Jackson County: 21.9 %Jerauld County: 12.4 %Jones County: 13 %Kingsbury County: 10.1 %Lake County: 8.7 %Lawrence County: 10.8 %Lincoln County: 6.4 %Lyman County: 16.7 %McCook County: 11.8 %McPherson County: 12.1 %Marshall County: 15.8 %Meade County: 9.5 %Mellette County: 19.4 %Miner County: 10.4 %Minnehaha County: 9.8 %Moody County: 14.7 %Oglala Lakota County: 16.7 %Pennington County: 13.2 %Perkins County: 14.4 %Potter County: 9.7 %Roberts County: 17.3 %Sanborn County: 10.8 %Spink County: 10.9 %Stanley County: 10 %Sully County: 11.2 %Todd County: 18.7 %Tripp County: 16.9 %Turner County: 10 %Union County: 7 %Walworth County: 13.5 %Yankton County: 10.2 %Ziebach County: 21.2 %
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%, 2018. 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, 2018

Jackson County: 21.9 %Jackson County21.9Ziebach County: 21.2 %Ziebach County21.2Corson County: 20.8 %Corson County20.8Bennett County: 20.1 %Bennett County20.1Mellette County: 19.4 %Mellette County19.4Buffalo County: 18.9 %Buffalo County18.9Todd County: 18.7 %Todd County18.7Dewey County: 18.4 %Dewey County18.4Roberts County: 17.3 %Roberts County17.3Charles Mix County: 17 %Charles Mix County17Tripp County: 16.9 %Tripp County16.9Lyman County: 16.7 %Lyman County16.7Oglala Lakota County: 16.7 %Oglala Lakota County16.7Brule County: 16.5 %Brule County16.5Gregory County: 16.1 %Gregory County16.1Marshall County: 15.8 %Marshall County15.8Aurora County: 15.6 %Aurora County15.6Beadle County: 15.2 %Beadle County15.2Moody County: 14.7 %Moody County14.7Douglas County: 14.6 %Douglas County14.6Perkins County: 14.4 %Perkins County14.4Day County: 14.1 %Day County14.1Walworth County: 13.5 %Walworth County13.5Butte County: 13.2 %Butte County13.2Pennington County: 13.2 %Pennington County13.2Clark County: 13 %Clark County13Jones County: 13 %Jones County13Hyde County: 12.6 %Hyde County12.6Jerauld County: 12.4 %Jerauld County12.4Custer County: 12.3 %Custer County12.3Hutchinson County: 12.3 %Hutchinson County12.3McPherson County: 12.1 %McPherson County12.1McCook County: 11.8 %McCook County11.8Harding County: 11.5 %Harding County11.5Grant County: 11.3 %Grant County11.3Hand County: 11.3 %Hand County11.3Sully County: 11.2 %Sully County11.2Bon Homme County: 11.1 %Bon Homme County11.1Fall River County: 11.1 %Fall River County11.1Faulk County: 11.1 %Faulk County11.1Jackson County: 21.9 %Jackson County21.9Ziebach County: 21.2 %Ziebach County21.2Corson County: 20.8 %Corson County20.8Bennett County: 20.1 %Bennett County20.1Mellette County: 19.4 %Mellette County19.4Buffalo County: 18.9 %Buffalo County18.9Todd County: 18.7 %Todd County18.7Dewey County: 18.4 %Dewey County18.4Roberts County: 17.3 %Roberts County17.3Charles Mix County: 17 %Charles Mix County17Tripp County: 16.9 %Tripp County16.9Lyman County: 16.7 %Lyman County16.7Oglala Lakota County: 16.7 %Oglala Lakota County16.7Brule County: 16.5 %Brule County16.5Gregory County: 16.1 %Gregory County16.1Marshall County: 15.8 %Marshall County15.8Aurora County: 15.6 %Aurora County15.6Beadle County: 15.2 %Beadle County15.2Moody County: 14.7 %Moody County14.7Douglas County: 14.6 %Douglas County14.6Perkins County: 14.4 %Perkins County14.4Day County: 14.1 %Day County14.1Walworth County: 13.5 %Walworth County13.5Butte County: 13.2 %Butte County13.2Pennington County: 13.2 %Pennington County13.2Clark County: 13 %Clark County13Jones County: 13 %Jones County13Hyde County: 12.6 %Hyde County12.6Jerauld County: 12.4 %Jerauld County12.4Custer County: 12.3 %Custer County12.3Hutchinson County: 12.3 %Hutchinson County12.3McPherson County: 12.1 %McPherson County12.1McCook County: 11.8 %McCook County11.8Harding County: 11.5 %Harding County11.5Grant County: 11.3 %Grant County11.3Hand County: 11.3 %Hand County11.3Sully County: 11.2 %Sully County11.2Bon Homme County: 11.1 %Bon Homme County11.1Fall River County: 11.1 %Fall River County11.1Faulk County: 11.1 %Faulk County11.1
%. 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

RankCounties2018 (%)Change on 2017
1Jackson County21.9-3 pts
2Ziebach County21.2-1.9 pts
3Corson County20.8-0.9 pts
4Bennett County20.1-1.7 pts
5Mellette County19.4-3.7 pts
6Buffalo County18.9-0.5 pts
7Todd County18.7+1.3 pts
8Dewey County18.4-1.5 pts
9Roberts County17.3-2.2 pts
10Charles Mix County17-0.1 pts
11Tripp County16.9-0.9 pts
12Lyman County16.7-2 pts
12Oglala Lakota County16.7-0.1 pts
14Brule County16.5-1.6 pts
15Gregory County16.1+1 pts
16Marshall County15.8-1.9 pts
17Aurora County15.6+0.1 pts
18Beadle County15.2+1.7 pts
19Moody County14.7-0.9 pts
20Douglas County14.6+1.1 pts
21Perkins County14.4-1.7 pts
22Day County14.1-0.4 pts
23Walworth County13.5+0.2 pts
24Butte County13.2+2 pts
24Pennington County13.2+1.5 pts
26Clark County13-1.6 pts
26Jones County13-3.3 pts
28Hyde County12.6+0.2 pts
29Jerauld County12.4+0.1 pts
30Custer County12.3+0.5 pts
30Hutchinson County12.3+0.1 pts
32McPherson County12.1-1.8 pts
33McCook County11.8+1.4 pts
34Harding County11.5-1.5 pts
35Grant County11.3+1 pts
35Hand County11.30 pts
37Sully County11.2-1.3 pts
38Bon Homme County11.10 pts
38Fall River County11.1+0.1 pts
38Faulk County11.1+1.3 pts
41Spink County10.90 pts
42Haakon County10.8-2.4 pts
42Lawrence County10.8+0.9 pts
42Sanborn County10.8-1.8 pts
45Campbell County10.7-0.7 pts
45Edmunds County10.7-1.1 pts
47Deuel County10.6+0.9 pts
47Hanson County10.6-0.5 pts
49Brown County10.5-0.2 pts
50Miner County10.4+0.4 pts
51Hughes County10.2+0.6 pts
51Yankton County10.2+0.9 pts
53Kingsbury County10.1+0.3 pts
54Stanley County10-0.4 pts
54Turner County10+0.3 pts
56Clay County9.9-0.6 pts
57Davison County9.8+1.4 pts
57Minnehaha County9.8+1.1 pts
59Hamlin County9.7-1.1 pts
59Potter County9.7-1.5 pts
61Meade County9.5-0.6 pts
62Brookings County9.1+0.2 pts
63Codington County8.9+0.3 pts
64Lake County8.7+0.9 pts
65Union County7-0.8 pts
66Lincoln County6.4+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-2018-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), 2018) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-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), 2018. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2018. 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), 2018. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2018.

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), 2018 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2018,
  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), 2018}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2018. 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-2018-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), 2018
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-2018-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/south-dakota-counties?period=2018.
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-2018-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)?

Jackson County, with 21.9% in 2018, according to the U.S. Census Bureau.

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

Lincoln County, with 6.4% in 2018.

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