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

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

Douglas County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 102 counties in 2020, at 14%. Brown County had the lowest, at 3.6%. The median was 8.5% and the figure for Illinois was 10.4%. Source: the U.S. Census Bureau.

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Highest14Douglas County
Lowest3.6Brown County
Median8.5102 counties
Illinois10.4History

Map of counties, 2020

Adams County: 7.7 %Alexander County: 8.7 %Bond County: 7.9 %Boone County: 10.2 %Brown County: 3.6 %Bureau County: 8.7 %Calhoun County: 8.8 %Carroll County: 7.5 %Cass County: 13.2 %Champaign County: 9.1 %Christian County: 7.6 %Clark County: 7.7 %Clay County: 9.2 %Clinton County: 7.1 %Coles County: 9.6 %Cook County: 12.8 %Crawford County: 7.6 %Cumberland County: 8.3 %DeKalb County: 9 %De Witt County: 7.6 %Douglas County: 14 %DuPage County: 7.4 %Edgar County: 7.5 %Edwards County: 7.7 %Effingham County: 8.3 %Fayette County: 9.7 %Ford County: 8.8 %Franklin County: 9.1 %Fulton County: 8.9 %Gallatin County: 9.4 %Greene County: 8.3 %Grundy County: 7.5 %Hamilton County: 7.9 %Hancock County: 7.6 %Hardin County: 8.9 %Henderson County: 8.6 %Henry County: 7.8 %Iroquois County: 10.7 %Jackson County: 10.7 %Jasper County: 8.6 %Jefferson County: 8 %Jersey County: 6.8 %Jo Daviess County: 8.5 %Johnson County: 6.9 %Kane County: 13.4 %Kankakee County: 10.1 %Kendall County: 6.8 %Knox County: 8.6 %Lake County: 9 %LaSalle County: 8.5 %Lawrence County: 7.7 %Lee County: 7 %Livingston County: 8 %Logan County: 6.9 %McDonough County: 10.1 %McHenry County: 7.7 %McLean County: 6.6 %Macon County: 7.9 %Macoupin County: 7.6 %Madison County: 7.6 %Marion County: 8.9 %Marshall County: 8.2 %Mason County: 9 %Massac County: 9.1 %Menard County: 6.6 %Mercer County: 7.3 %Monroe County: 5 %Montgomery County: 8.5 %Morgan County: 7.6 %Moultrie County: 11 %Ogle County: 8.4 %Peoria County: 8.9 %Perry County: 7.5 %Piatt County: 7.2 %Pike County: 9 %Pope County: 8.9 %Pulaski County: 10.3 %Putnam County: 8.1 %Randolph County: 7 %Richland County: 8.9 %Rock Island County: 9.7 %St. Clair County: 8.5 %Saline County: 9.1 %Sangamon County: 6.8 %Schuyler County: 9.7 %Scott County: 8 %Shelby County: 7.5 %Stark County: 9.5 %Stephenson County: 7.7 %Tazewell County: 6.9 %Union County: 9.5 %Vermilion County: 8.6 %Wabash County: 8.1 %Warren County: 10.8 %Washington County: 6.3 %Wayne County: 10.8 %White County: 9.3 %Whiteside County: 9.1 %Will County: 8.5 %Williamson County: 7.9 %Winnebago County: 10.7 %Woodford County: 6.4 %
  • Under 7.4
  • 7.4 to 7.7
  • 7.7 to 8.4
  • 8.4 to 8.9
  • 8.9 to 9.6
  • 9.6 and over
%, 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

Douglas County: 14 %Douglas County14Kane County: 13.4 %Kane County13.4Cass County: 13.2 %Cass County13.2Cook County: 12.8 %Cook County12.8Moultrie County: 11 %Moultrie County11Warren County: 10.8 %Warren County10.8Wayne County: 10.8 %Wayne County10.8Iroquois County: 10.7 %Iroquois County10.7Jackson County: 10.7 %Jackson County10.7Winnebago County: 10.7 %Winnebago County10.7Pulaski County: 10.3 %Pulaski County10.3Boone County: 10.2 %Boone County10.2Kankakee County: 10.1 %Kankakee County10.1McDonough County: 10.1 %McDonough County10.1Fayette County: 9.7 %Fayette County9.7Rock Island County: 9.7 %Rock Island County9.7Schuyler County: 9.7 %Schuyler County9.7Coles County: 9.6 %Coles County9.6Stark County: 9.5 %Stark County9.5Union County: 9.5 %Union County9.5Gallatin County: 9.4 %Gallatin County9.4White County: 9.3 %White County9.3Clay County: 9.2 %Clay County9.2Champaign County: 9.1 %Champaign County9.1Franklin County: 9.1 %Franklin County9.1Massac County: 9.1 %Massac County9.1Saline County: 9.1 %Saline County9.1Whiteside County: 9.1 %Whiteside County9.1DeKalb County: 9 %DeKalb County9Lake County: 9 %Lake County9Mason County: 9 %Mason County9Pike County: 9 %Pike County9Fulton County: 8.9 %Fulton County8.9Hardin County: 8.9 %Hardin County8.9Marion County: 8.9 %Marion County8.9Peoria County: 8.9 %Peoria County8.9Pope County: 8.9 %Pope County8.9Richland County: 8.9 %Richland County8.9Calhoun County: 8.8 %Calhoun County8.8Ford County: 8.8 %Ford County8.8Douglas County: 14 %Douglas County14Kane County: 13.4 %Kane County13.4Cass County: 13.2 %Cass County13.2Cook County: 12.8 %Cook County12.8Moultrie County: 11 %Moultrie County11Warren County: 10.8 %Warren County10.8Wayne County: 10.8 %Wayne County10.8Iroquois County: 10.7 %Iroquois County10.7Jackson County: 10.7 %Jackson County10.7Winnebago County: 10.7 %Winnebago County10.7Pulaski County: 10.3 %Pulaski County10.3Boone County: 10.2 %Boone County10.2Kankakee County: 10.1 %Kankakee County10.1McDonough County: 10.1 %McDonough County10.1Fayette County: 9.7 %Fayette County9.7Rock Island County: 9.7 %Rock Island County9.7Schuyler County: 9.7 %Schuyler County9.7Coles County: 9.6 %Coles County9.6Stark County: 9.5 %Stark County9.5Union County: 9.5 %Union County9.5Gallatin County: 9.4 %Gallatin County9.4White County: 9.3 %White County9.3Clay County: 9.2 %Clay County9.2Champaign County: 9.1 %Champaign County9.1Franklin County: 9.1 %Franklin County9.1Massac County: 9.1 %Massac County9.1Saline County: 9.1 %Saline County9.1Whiteside County: 9.1 %Whiteside County9.1DeKalb County: 9 %DeKalb County9Lake County: 9 %Lake County9Mason County: 9 %Mason County9Pike County: 9 %Pike County9Fulton County: 8.9 %Fulton County8.9Hardin County: 8.9 %Hardin County8.9Marion County: 8.9 %Marion County8.9Peoria County: 8.9 %Peoria County8.9Pope County: 8.9 %Pope County8.9Richland County: 8.9 %Richland County8.9Calhoun County: 8.8 %Calhoun County8.8Ford County: 8.8 %Ford County8.8
%. 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
1Douglas County14+1.4 pts
2Kane County13.4+0.7 pts
3Cass County13.2+1 pts
4Cook County12.8-0.3 pts
5Moultrie County11+0.6 pts
6Warren County10.8+0.7 pts
6Wayne County10.8+0.6 pts
8Iroquois County10.7+0.4 pts
8Jackson County10.7+1.1 pts
8Winnebago County10.7+0.7 pts
11Pulaski County10.3+0.2 pts
12Boone County10.2-0.1 pts
13Kankakee County10.1+1 pts
13McDonough County10.1+1.5 pts
15Fayette County9.7-1.4 pts
15Rock Island County9.70 pts
15Schuyler County9.7+1.2 pts
18Coles County9.6+0.9 pts
19Stark County9.5+1.1 pts
19Union County9.5-0.4 pts
21Gallatin County9.4+1.2 pts
22White County9.3+0.8 pts
23Clay County9.2+0.7 pts
24Champaign County9.1+0.9 pts
24Franklin County9.1-0.7 pts
24Massac County9.1+0.6 pts
24Saline County9.1+0.1 pts
24Whiteside County9.1+1 pts
29DeKalb County90 pts
29Lake County9-0.9 pts
29Mason County9+0.9 pts
29Pike County9-0.3 pts
33Fulton County8.9-0.5 pts
33Hardin County8.9-0.5 pts
33Marion County8.9+0.3 pts
33Peoria County8.9+0.1 pts
33Pope County8.9-0.4 pts
33Richland County8.9-0.3 pts
39Calhoun County8.8+0.7 pts
39Ford County8.8+0.3 pts
41Alexander County8.7-0.9 pts
41Bureau County8.7+0.2 pts
43Henderson County8.6-0.2 pts
43Jasper County8.6+0.4 pts
43Knox County8.6-0.2 pts
43Vermilion County8.6+0.4 pts
47Jo Daviess County8.5-0.8 pts
47LaSalle County8.5+0.7 pts
47Montgomery County8.5+0.1 pts
47St. Clair County8.5-0.2 pts
47Will County8.50 pts
52Ogle County8.4+0.1 pts
53Cumberland County8.3+0.1 pts
53Effingham County8.3+1.2 pts
53Greene County8.3-0.1 pts
56Marshall County8.2+0.8 pts
57Putnam County8.1+1 pts
57Wabash County8.1+0.2 pts
59Jefferson County8-0.7 pts
59Livingston County8+0.2 pts
59Scott County8+1.5 pts
62Bond County7.9-0.4 pts
62Hamilton County7.9-0.1 pts
62Macon County7.9+0.7 pts
62Williamson County7.9-0.2 pts
66Henry County7.8-0.4 pts
67Adams County7.7+0.3 pts
67Clark County7.7+0.1 pts
67Edwards County7.7+0.5 pts
67Lawrence County7.7-1.3 pts
67McHenry County7.7-0.7 pts
67Stephenson County7.7-0.2 pts
73Christian County7.6-0.5 pts
73Crawford County7.6-0.4 pts
73De Witt County7.60 pts
73Hancock County7.6-0.4 pts
73Macoupin County7.6-0.3 pts
73Madison County7.6-0.2 pts
73Morgan County7.6+0.4 pts
80Carroll County7.5-1.1 pts
80Edgar County7.5-0.6 pts
80Grundy County7.5+1 pts
80Perry County7.5-0.7 pts
80Shelby County7.5+0.4 pts
85DuPage County7.4-0.1 pts
86Mercer County7.3-0.2 pts
87Piatt County7.2+0.6 pts
88Clinton County7.1+0.2 pts
89Lee County7-0.4 pts
89Randolph County7-0.8 pts
91Johnson County6.9-1.6 pts
91Logan County6.9+0.4 pts
91Tazewell County6.9+0.3 pts
94Jersey County6.8-0.1 pts
94Kendall County6.8-0.9 pts
94Sangamon County6.8-1 pts
97McLean County6.6+0.1 pts
97Menard County6.6-0.1 pts
99Woodford County6.40 pts
100Washington County6.3-0.1 pts
101Monroe County5+0.5 pts
102Brown County3.6-1.3 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 Illinois 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 Illinois 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/illinois-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 Illinois 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/illinois-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 Illinois 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/illinois-counties?period=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_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 Illinois 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/illinois-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 Illinois 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/illinois-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-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)?

Douglas County, with 14% in 2020, according to the U.S. Census Bureau.

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

Brown County, with 3.6% 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 Illinois: more rankings