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 2018, at 28.5%. Lincoln County had the lowest, at 7.9%. The median was 13.3% and the figure for South Dakota was 13.6%. Source: the U.S. Census Bureau.

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Highest28.5Buffalo County
Lowest7.9Lincoln County
Median13.366 counties
South Dakota13.6History

Map of counties, 2018

Aurora County: 17.6 %Beadle County: 18.7 %Bennett County: 27.3 %Bon Homme County: 13.1 %Brookings County: 10.8 %Brown County: 12.7 %Brule County: 18.9 %Buffalo County: 28.5 %Butte County: 16 %Campbell County: 11.1 %Charles Mix County: 21.3 %Clark County: 15.1 %Clay County: 11.6 %Codington County: 10.9 %Corson County: 28.3 %Custer County: 13.5 %Davison County: 11.8 %Day County: 16.1 %Deuel County: 12 %Dewey County: 26 %Douglas County: 16.3 %Edmunds County: 11.8 %Fall River County: 12.9 %Faulk County: 13 %Grant County: 13.1 %Gregory County: 19 %Haakon County: 11.9 %Hamlin County: 11.9 %Hand County: 11.9 %Hanson County: 12.7 %Harding County: 13.2 %Hughes County: 12.4 %Hutchinson County: 14.4 %Hyde County: 13.9 %Jackson County: 28.4 %Jerauld County: 13.3 %Jones County: 14.2 %Kingsbury County: 11.2 %Lake County: 10.1 %Lawrence County: 12.7 %Lincoln County: 7.9 %Lyman County: 20.5 %McCook County: 14.1 %McPherson County: 13.7 %Marshall County: 18.2 %Meade County: 11.2 %Mellette County: 25.6 %Miner County: 11.7 %Minnehaha County: 12.1 %Moody County: 17.4 %Oglala Lakota County: 24.4 %Pennington County: 16 %Perkins County: 15.8 %Potter County: 11.1 %Roberts County: 21.3 %Sanborn County: 12.2 %Spink County: 12.2 %Stanley County: 11.7 %Sully County: 12 %Todd County: 28.1 %Tripp County: 20 %Turner County: 11.8 %Union County: 8 %Walworth County: 16.5 %Yankton County: 12.1 %Ziebach County: 26.5 %
  • Under 12
  • 12 to 13
  • 13 to 16
  • 16 to 21
  • 21 and over
%, 2018. 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, 2018

Buffalo County: 28.5 %Buffalo County28.5Jackson County: 28.4 %Jackson County28.4Corson County: 28.3 %Corson County28.3Todd County: 28.1 %Todd County28.1Bennett County: 27.3 %Bennett County27.3Ziebach County: 26.5 %Ziebach County26.5Dewey County: 26 %Dewey County26Mellette County: 25.6 %Mellette County25.6Oglala Lakota County: 24.4 %Oglala Lakota County24.4Charles Mix County: 21.3 %Charles Mix County21.3Roberts County: 21.3 %Roberts County21.3Lyman County: 20.5 %Lyman County20.5Tripp County: 20 %Tripp County20Gregory County: 19 %Gregory County19Brule County: 18.9 %Brule County18.9Beadle County: 18.7 %Beadle County18.7Marshall County: 18.2 %Marshall County18.2Aurora County: 17.6 %Aurora County17.6Moody County: 17.4 %Moody County17.4Walworth County: 16.5 %Walworth County16.5Douglas County: 16.3 %Douglas County16.3Day County: 16.1 %Day County16.1Butte County: 16 %Butte County16Pennington County: 16 %Pennington County16Perkins County: 15.8 %Perkins County15.8Clark County: 15.1 %Clark County15.1Hutchinson County: 14.4 %Hutchinson County14.4Jones County: 14.2 %Jones County14.2McCook County: 14.1 %McCook County14.1Hyde County: 13.9 %Hyde County13.9McPherson County: 13.7 %McPherson County13.7Custer County: 13.5 %Custer County13.5Jerauld County: 13.3 %Jerauld County13.3Harding County: 13.2 %Harding County13.2Bon Homme County: 13.1 %Bon Homme County13.1Grant County: 13.1 %Grant County13.1Faulk County: 13 %Faulk County13Fall River County: 12.9 %Fall River County12.9Brown County: 12.7 %Brown County12.7Hanson County: 12.7 %Hanson County12.7Buffalo County: 28.5 %Buffalo County28.5Jackson County: 28.4 %Jackson County28.4Corson County: 28.3 %Corson County28.3Todd County: 28.1 %Todd County28.1Bennett County: 27.3 %Bennett County27.3Ziebach County: 26.5 %Ziebach County26.5Dewey County: 26 %Dewey County26Mellette County: 25.6 %Mellette County25.6Oglala Lakota County: 24.4 %Oglala Lakota County24.4Charles Mix County: 21.3 %Charles Mix County21.3Roberts County: 21.3 %Roberts County21.3Lyman County: 20.5 %Lyman County20.5Tripp County: 20 %Tripp County20Gregory County: 19 %Gregory County19Brule County: 18.9 %Brule County18.9Beadle County: 18.7 %Beadle County18.7Marshall County: 18.2 %Marshall County18.2Aurora County: 17.6 %Aurora County17.6Moody County: 17.4 %Moody County17.4Walworth County: 16.5 %Walworth County16.5Douglas County: 16.3 %Douglas County16.3Day County: 16.1 %Day County16.1Butte County: 16 %Butte County16Pennington County: 16 %Pennington County16Perkins County: 15.8 %Perkins County15.8Clark County: 15.1 %Clark County15.1Hutchinson County: 14.4 %Hutchinson County14.4Jones County: 14.2 %Jones County14.2McCook County: 14.1 %McCook County14.1Hyde County: 13.9 %Hyde County13.9McPherson County: 13.7 %McPherson County13.7Custer County: 13.5 %Custer County13.5Jerauld County: 13.3 %Jerauld County13.3Harding County: 13.2 %Harding County13.2Bon Homme County: 13.1 %Bon Homme County13.1Grant County: 13.1 %Grant County13.1Faulk County: 13 %Faulk County13Fall River County: 12.9 %Fall River County12.9Brown County: 12.7 %Brown County12.7Hanson County: 12.7 %Hanson County12.7
%. 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

RankCounties2018 (%)Change on 2017
1Buffalo County28.5+1.1 pts
2Jackson County28.4-2.7 pts
3Corson County28.3-0.1 pts
4Todd County28.1+2.6 pts
5Bennett County27.3-1.2 pts
6Ziebach County26.5-1.7 pts
7Dewey County26-0.9 pts
8Mellette County25.6-3.4 pts
9Oglala Lakota County24.4+0.4 pts
10Charles Mix County21.3+0.2 pts
10Roberts County21.3-1.3 pts
12Lyman County20.5-2.1 pts
13Tripp County20-0.2 pts
14Gregory County19+2 pts
15Brule County18.9-0.9 pts
16Beadle County18.7+2.1 pts
17Marshall County18.2-0.6 pts
18Aurora County17.6+0.8 pts
19Moody County17.4+0.1 pts
20Walworth County16.5+0.6 pts
21Douglas County16.3+2.1 pts
22Day County16.1+0.5 pts
23Butte County16+2.5 pts
23Pennington County16+2 pts
25Perkins County15.8-0.8 pts
26Clark County15.1-1 pts
27Hutchinson County14.4+0.9 pts
28Jones County14.2-3.2 pts
29McCook County14.1+2.1 pts
30Hyde County13.9+0.7 pts
31McPherson County13.7-0.9 pts
32Custer County13.5+0.6 pts
33Jerauld County13.3+1 pts
34Harding County13.2-1 pts
35Bon Homme County13.1+0.9 pts
35Grant County13.1+1.2 pts
37Faulk County13+2.2 pts
38Fall River County12.9+0.4 pts
39Brown County12.7+0.2 pts
39Hanson County12.70 pts
39Lawrence County12.7+1.3 pts
42Hughes County12.4+1.1 pts
43Sanborn County12.2-1.8 pts
43Spink County12.2+0.1 pts
45Minnehaha County12.1+1.7 pts
45Yankton County12.1+1.1 pts
47Deuel County12+1.3 pts
47Sully County12-1.3 pts
49Haakon County11.9-1.5 pts
49Hamlin County11.9-0.7 pts
49Hand County11.9+0.5 pts
52Davison County11.8+1.9 pts
52Edmunds County11.8-0.4 pts
52Turner County11.8+0.7 pts
55Miner County11.7+0.8 pts
55Stanley County11.7-0.2 pts
57Clay County11.6-0.3 pts
58Kingsbury County11.2+0.4 pts
58Meade County11.2-0.8 pts
60Campbell County11.1-0.6 pts
60Potter County11.1-1.3 pts
62Codington County10.9+0.6 pts
63Brookings County10.8+0.4 pts
64Lake County10.1+1.4 pts
65Union County8-0.8 pts
66Lincoln County7.9+0.6 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-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, 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), 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, 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), 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-ages-18-64/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, 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), 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-ages-18-64/south-dakota-counties?period=2018.

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), 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-ages-18-64/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, 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), 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-ages-18-64/south-dakota-counties?period=2018. 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-2018-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), 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-ages-18-64/south-dakota-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/south-dakota-counties?period=2018.
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-2018-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 28.5% in 2018, according to the U.S. Census Bureau.

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

Lincoln County, with 7.9% 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, 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