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 2021, at 13.1%. Brown County had the lowest, at 4.8%. The median was 8.2% and the figure for Illinois was 10.1%. Source: the U.S. Census Bureau.

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Highest13.1Douglas County
Lowest4.8Brown County
Median8.2102 counties
Illinois10.1History

Map of counties, 2021

Adams County: 7.1 %Alexander County: 9.2 %Bond County: 8.2 %Boone County: 10 %Brown County: 4.8 %Bureau County: 9.3 %Calhoun County: 7.2 %Carroll County: 8.5 %Cass County: 12.7 %Champaign County: 7.6 %Christian County: 8.1 %Clark County: 7.2 %Clay County: 8.1 %Clinton County: 7.1 %Coles County: 9.1 %Cook County: 12.5 %Crawford County: 7.8 %Cumberland County: 7.5 %DeKalb County: 9 %De Witt County: 7.3 %Douglas County: 13.1 %DuPage County: 7.1 %Edgar County: 7.3 %Edwards County: 8.9 %Effingham County: 6.5 %Fayette County: 9.5 %Ford County: 8.7 %Franklin County: 9.8 %Fulton County: 7.6 %Gallatin County: 9.4 %Greene County: 7.7 %Grundy County: 5.8 %Hamilton County: 8.4 %Hancock County: 7.5 %Hardin County: 8.8 %Henderson County: 8.7 %Henry County: 7 %Iroquois County: 10 %Jackson County: 9.2 %Jasper County: 7.2 %Jefferson County: 8.5 %Jersey County: 6.7 %Jo Daviess County: 8.3 %Johnson County: 7.8 %Kane County: 10.9 %Kankakee County: 9.6 %Kendall County: 7.6 %Knox County: 8.9 %Lake County: 9.7 %LaSalle County: 8.4 %Lawrence County: 8.5 %Lee County: 7.7 %Livingston County: 8.3 %Logan County: 6.5 %McDonough County: 7.7 %McHenry County: 7.1 %McLean County: 7.5 %Macon County: 7.6 %Macoupin County: 8.1 %Madison County: 7.2 %Marion County: 8.7 %Marshall County: 7.3 %Mason County: 8.6 %Massac County: 8.5 %Menard County: 5.6 %Mercer County: 8 %Monroe County: 4.9 %Montgomery County: 8.4 %Morgan County: 8 %Moultrie County: 10.7 %Ogle County: 8.6 %Peoria County: 9.2 %Perry County: 7.6 %Piatt County: 6.5 %Pike County: 8.9 %Pope County: 7.7 %Pulaski County: 9.6 %Putnam County: 8.7 %Randolph County: 8.2 %Richland County: 8.1 %Rock Island County: 10.4 %St. Clair County: 8.4 %Saline County: 9 %Sangamon County: 7.4 %Schuyler County: 9.5 %Scott County: 7.8 %Shelby County: 6.6 %Stark County: 9.7 %Stephenson County: 8.1 %Tazewell County: 6.8 %Union County: 9.4 %Vermilion County: 8.2 %Wabash County: 7.9 %Warren County: 9.5 %Washington County: 5.7 %Wayne County: 10.7 %White County: 8.2 %Whiteside County: 8.3 %Will County: 8.1 %Williamson County: 7.4 %Winnebago County: 10.5 %Woodford County: 6.3 %
  • Under 7.2
  • 7.2 to 7.7
  • 7.7 to 8.2
  • 8.2 to 8.7
  • 8.7 to 9.5
  • 9.5 and over
%, 2021. 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, 2021

Douglas County: 13.1 %Douglas County13.1Cass County: 12.7 %Cass County12.7Cook County: 12.5 %Cook County12.5Kane County: 10.9 %Kane County10.9Moultrie County: 10.7 %Moultrie County10.7Wayne County: 10.7 %Wayne County10.7Winnebago County: 10.5 %Winnebago County10.5Rock Island County: 10.4 %Rock Island County10.4Boone County: 10 %Boone County10Iroquois County: 10 %Iroquois County10Franklin County: 9.8 %Franklin County9.8Lake County: 9.7 %Lake County9.7Stark County: 9.7 %Stark County9.7Kankakee County: 9.6 %Kankakee County9.6Pulaski County: 9.6 %Pulaski County9.6Fayette County: 9.5 %Fayette County9.5Schuyler County: 9.5 %Schuyler County9.5Warren County: 9.5 %Warren County9.5Gallatin County: 9.4 %Gallatin County9.4Union County: 9.4 %Union County9.4Bureau County: 9.3 %Bureau County9.3Alexander County: 9.2 %Alexander County9.2Jackson County: 9.2 %Jackson County9.2Peoria County: 9.2 %Peoria County9.2Coles County: 9.1 %Coles County9.1DeKalb County: 9 %DeKalb County9Saline County: 9 %Saline County9Edwards County: 8.9 %Edwards County8.9Knox County: 8.9 %Knox County8.9Pike County: 8.9 %Pike County8.9Hardin County: 8.8 %Hardin County8.8Ford County: 8.7 %Ford County8.7Henderson County: 8.7 %Henderson County8.7Marion County: 8.7 %Marion County8.7Putnam County: 8.7 %Putnam County8.7Mason County: 8.6 %Mason County8.6Ogle County: 8.6 %Ogle County8.6Carroll County: 8.5 %Carroll County8.5Jefferson County: 8.5 %Jefferson County8.5Lawrence County: 8.5 %Lawrence County8.5Douglas County: 13.1 %Douglas County13.1Cass County: 12.7 %Cass County12.7Cook County: 12.5 %Cook County12.5Kane County: 10.9 %Kane County10.9Moultrie County: 10.7 %Moultrie County10.7Wayne County: 10.7 %Wayne County10.7Winnebago County: 10.5 %Winnebago County10.5Rock Island County: 10.4 %Rock Island County10.4Boone County: 10 %Boone County10Iroquois County: 10 %Iroquois County10Franklin County: 9.8 %Franklin County9.8Lake County: 9.7 %Lake County9.7Stark County: 9.7 %Stark County9.7Kankakee County: 9.6 %Kankakee County9.6Pulaski County: 9.6 %Pulaski County9.6Fayette County: 9.5 %Fayette County9.5Schuyler County: 9.5 %Schuyler County9.5Warren County: 9.5 %Warren County9.5Gallatin County: 9.4 %Gallatin County9.4Union County: 9.4 %Union County9.4Bureau County: 9.3 %Bureau County9.3Alexander County: 9.2 %Alexander County9.2Jackson County: 9.2 %Jackson County9.2Peoria County: 9.2 %Peoria County9.2Coles County: 9.1 %Coles County9.1DeKalb County: 9 %DeKalb County9Saline County: 9 %Saline County9Edwards County: 8.9 %Edwards County8.9Knox County: 8.9 %Knox County8.9Pike County: 8.9 %Pike County8.9Hardin County: 8.8 %Hardin County8.8Ford County: 8.7 %Ford County8.7Henderson County: 8.7 %Henderson County8.7Marion County: 8.7 %Marion County8.7Putnam County: 8.7 %Putnam County8.7Mason County: 8.6 %Mason County8.6Ogle County: 8.6 %Ogle County8.6Carroll County: 8.5 %Carroll County8.5Jefferson County: 8.5 %Jefferson County8.5Lawrence County: 8.5 %Lawrence County8.5
%. 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

RankCounties2021 (%)Change on 2020
1Douglas County13.1-0.9 pts
2Cass County12.7-0.5 pts
3Cook County12.5-0.3 pts
4Kane County10.9-2.5 pts
5Moultrie County10.7-0.3 pts
5Wayne County10.7-0.1 pts
7Winnebago County10.5-0.2 pts
8Rock Island County10.4+0.7 pts
9Boone County10-0.2 pts
9Iroquois County10-0.7 pts
11Franklin County9.8+0.7 pts
12Lake County9.7+0.7 pts
12Stark County9.7+0.2 pts
14Kankakee County9.6-0.5 pts
14Pulaski County9.6-0.7 pts
16Fayette County9.5-0.2 pts
16Schuyler County9.5-0.2 pts
16Warren County9.5-1.3 pts
19Gallatin County9.40 pts
19Union County9.4-0.1 pts
21Bureau County9.3+0.6 pts
22Alexander County9.2+0.5 pts
22Jackson County9.2-1.5 pts
22Peoria County9.2+0.3 pts
25Coles County9.1-0.5 pts
26DeKalb County90 pts
26Saline County9-0.1 pts
28Edwards County8.9+1.2 pts
28Knox County8.9+0.3 pts
28Pike County8.9-0.1 pts
31Hardin County8.8-0.1 pts
32Ford County8.7-0.1 pts
32Henderson County8.7+0.1 pts
32Marion County8.7-0.2 pts
32Putnam County8.7+0.6 pts
36Mason County8.6-0.4 pts
36Ogle County8.6+0.2 pts
38Carroll County8.5+1 pts
38Jefferson County8.5+0.5 pts
38Lawrence County8.5+0.8 pts
38Massac County8.5-0.6 pts
42Hamilton County8.4+0.5 pts
42LaSalle County8.4-0.1 pts
42Montgomery County8.4-0.1 pts
42St. Clair County8.4-0.1 pts
46Jo Daviess County8.3-0.2 pts
46Livingston County8.3+0.3 pts
46Whiteside County8.3-0.8 pts
49Bond County8.2+0.3 pts
49Randolph County8.2+1.2 pts
49Vermilion County8.2-0.4 pts
49White County8.2-1.1 pts
53Christian County8.1+0.5 pts
53Clay County8.1-1.1 pts
53Macoupin County8.1+0.5 pts
53Richland County8.1-0.8 pts
53Stephenson County8.1+0.4 pts
53Will County8.1-0.4 pts
59Mercer County8+0.7 pts
59Morgan County8+0.4 pts
61Wabash County7.9-0.2 pts
62Crawford County7.8+0.2 pts
62Johnson County7.8+0.9 pts
62Scott County7.8-0.2 pts
65Greene County7.7-0.6 pts
65Lee County7.7+0.7 pts
65McDonough County7.7-2.4 pts
65Pope County7.7-1.2 pts
69Champaign County7.6-1.5 pts
69Fulton County7.6-1.3 pts
69Kendall County7.6+0.8 pts
69Macon County7.6-0.3 pts
69Perry County7.6+0.1 pts
74Cumberland County7.5-0.8 pts
74Hancock County7.5-0.1 pts
74McLean County7.5+0.9 pts
77Sangamon County7.4+0.6 pts
77Williamson County7.4-0.5 pts
79De Witt County7.3-0.3 pts
79Edgar County7.3-0.2 pts
79Marshall County7.3-0.9 pts
82Calhoun County7.2-1.6 pts
82Clark County7.2-0.5 pts
82Jasper County7.2-1.4 pts
82Madison County7.2-0.4 pts
86Adams County7.1-0.6 pts
86Clinton County7.10 pts
86DuPage County7.1-0.3 pts
86McHenry County7.1-0.6 pts
90Henry County7-0.8 pts
91Tazewell County6.8-0.1 pts
92Jersey County6.7-0.1 pts
93Shelby County6.6-0.9 pts
94Effingham County6.5-1.8 pts
94Logan County6.5-0.4 pts
94Piatt County6.5-0.7 pts
97Woodford County6.3-0.1 pts
98Grundy County5.8-1.7 pts
99Washington County5.7-0.6 pts
100Menard County5.6-1 pts
101Monroe County4.9-0.1 pts
102Brown County4.8+1.2 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-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, 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), 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, 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), 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-ages-18-64/illinois-counties?period=2021. 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), 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-ages-18-64/illinois-counties?period=2021.

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), 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-ages-18-64/illinois-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2021,
  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), 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-ages-18-64/illinois-counties?period=2021. 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-2021-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), 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-ages-18-64/illinois-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2021.
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-2021-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 13.1% in 2021, 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 4.8% 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, 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