Data / Rankings / Uninsured rate, under 65 (US model-based estimate) / Counties in Illinois

Counties in Illinois by uninsured rate, under 65 (US model-based estimate)

Douglas County had the highest uninsured rate, under 65 (US model-based estimate) of 102 counties in 2021, at 11.5%. Brown County had the lowest, at 3.8%. The median was 6.8% and the figure for Illinois was 8.2%. Source: the U.S. Census Bureau.

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Highest11.5Douglas County
Lowest3.8Brown County
Median6.8102 counties
Illinois8.2History

Map of counties, 2021

Adams County: 5.8 %Alexander County: 7.4 %Bond County: 6.9 %Boone County: 8.2 %Brown County: 3.8 %Bureau County: 7.8 %Calhoun County: 6.2 %Carroll County: 7.3 %Cass County: 10.3 %Champaign County: 6.5 %Christian County: 6.8 %Clark County: 5.9 %Clay County: 6.6 %Clinton County: 6.1 %Coles County: 7.8 %Cook County: 10.1 %Crawford County: 6.5 %Cumberland County: 6.5 %DeKalb County: 7.4 %De Witt County: 6.2 %Douglas County: 11.5 %DuPage County: 5.8 %Edgar County: 6.1 %Edwards County: 7.5 %Effingham County: 5.3 %Fayette County: 8 %Ford County: 7.2 %Franklin County: 8.1 %Fulton County: 6.3 %Gallatin County: 8.1 %Greene County: 6.5 %Grundy County: 5 %Hamilton County: 7.1 %Hancock County: 6.2 %Hardin County: 7.4 %Henderson County: 7.5 %Henry County: 5.8 %Iroquois County: 8.5 %Jackson County: 7.9 %Jasper County: 6 %Jefferson County: 7.1 %Jersey County: 5.6 %Jo Daviess County: 7.1 %Johnson County: 6.6 %Kane County: 8.8 %Kankakee County: 7.8 %Kendall County: 6.1 %Knox County: 7.2 %Lake County: 7.8 %LaSalle County: 7.1 %Lawrence County: 6.9 %Lee County: 6.4 %Livingston County: 6.9 %Logan County: 5.5 %McDonough County: 6.6 %McHenry County: 5.9 %McLean County: 6.2 %Macon County: 6.2 %Macoupin County: 6.8 %Madison County: 5.9 %Marion County: 7 %Marshall County: 6.3 %Mason County: 7.3 %Massac County: 7 %Menard County: 4.9 %Mercer County: 6.7 %Monroe County: 4.1 %Montgomery County: 7 %Morgan County: 6.8 %Moultrie County: 9 %Ogle County: 7.2 %Peoria County: 7.2 %Perry County: 6.3 %Piatt County: 5.5 %Pike County: 7.4 %Pope County: 7 %Pulaski County: 8.1 %Putnam County: 7.7 %Randolph County: 6.8 %Richland County: 6.7 %Rock Island County: 8.4 %St. Clair County: 6.8 %Saline County: 7.5 %Sangamon County: 6.2 %Schuyler County: 8.1 %Scott County: 6.7 %Shelby County: 5.5 %Stark County: 8.4 %Stephenson County: 6.6 %Tazewell County: 5.6 %Union County: 7.9 %Vermilion County: 6.5 %Wabash County: 6.5 %Warren County: 7.8 %Washington County: 4.9 %Wayne County: 9.2 %White County: 6.8 %Whiteside County: 6.8 %Will County: 6.6 %Williamson County: 6.1 %Winnebago County: 8.5 %Woodford County: 5.3 %
  • Under 5.9
  • 5.9 to 6.5
  • 6.5 to 6.8
  • 6.8 to 7.2
  • 7.2 to 7.9
  • 7.9 and over
%, 2021. 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, 2021

Douglas County: 11.5 %Douglas County11.5Cass County: 10.3 %Cass County10.3Cook County: 10.1 %Cook County10.1Wayne County: 9.2 %Wayne County9.2Moultrie County: 9 %Moultrie County9Kane County: 8.8 %Kane County8.8Iroquois County: 8.5 %Iroquois County8.5Winnebago County: 8.5 %Winnebago County8.5Rock Island County: 8.4 %Rock Island County8.4Stark County: 8.4 %Stark County8.4Boone County: 8.2 %Boone County8.2Franklin County: 8.1 %Franklin County8.1Gallatin County: 8.1 %Gallatin County8.1Pulaski County: 8.1 %Pulaski County8.1Schuyler County: 8.1 %Schuyler County8.1Fayette County: 8 %Fayette County8Jackson County: 7.9 %Jackson County7.9Union County: 7.9 %Union County7.9Bureau County: 7.8 %Bureau County7.8Coles County: 7.8 %Coles County7.8Kankakee County: 7.8 %Kankakee County7.8Lake County: 7.8 %Lake County7.8Warren County: 7.8 %Warren County7.8Putnam County: 7.7 %Putnam County7.7Edwards County: 7.5 %Edwards County7.5Henderson County: 7.5 %Henderson County7.5Saline County: 7.5 %Saline County7.5Alexander County: 7.4 %Alexander County7.4DeKalb County: 7.4 %DeKalb County7.4Hardin County: 7.4 %Hardin County7.4Pike County: 7.4 %Pike County7.4Carroll County: 7.3 %Carroll County7.3Mason County: 7.3 %Mason County7.3Ford County: 7.2 %Ford County7.2Knox County: 7.2 %Knox County7.2Ogle County: 7.2 %Ogle County7.2Peoria County: 7.2 %Peoria County7.2Hamilton County: 7.1 %Hamilton County7.1Jefferson County: 7.1 %Jefferson County7.1Jo Daviess County: 7.1 %Jo Daviess County7.1Douglas County: 11.5 %Douglas County11.5Cass County: 10.3 %Cass County10.3Cook County: 10.1 %Cook County10.1Wayne County: 9.2 %Wayne County9.2Moultrie County: 9 %Moultrie County9Kane County: 8.8 %Kane County8.8Iroquois County: 8.5 %Iroquois County8.5Winnebago County: 8.5 %Winnebago County8.5Rock Island County: 8.4 %Rock Island County8.4Stark County: 8.4 %Stark County8.4Boone County: 8.2 %Boone County8.2Franklin County: 8.1 %Franklin County8.1Gallatin County: 8.1 %Gallatin County8.1Pulaski County: 8.1 %Pulaski County8.1Schuyler County: 8.1 %Schuyler County8.1Fayette County: 8 %Fayette County8Jackson County: 7.9 %Jackson County7.9Union County: 7.9 %Union County7.9Bureau County: 7.8 %Bureau County7.8Coles County: 7.8 %Coles County7.8Kankakee County: 7.8 %Kankakee County7.8Lake County: 7.8 %Lake County7.8Warren County: 7.8 %Warren County7.8Putnam County: 7.7 %Putnam County7.7Edwards County: 7.5 %Edwards County7.5Henderson County: 7.5 %Henderson County7.5Saline County: 7.5 %Saline County7.5Alexander County: 7.4 %Alexander County7.4DeKalb County: 7.4 %DeKalb County7.4Hardin County: 7.4 %Hardin County7.4Pike County: 7.4 %Pike County7.4Carroll County: 7.3 %Carroll County7.3Mason County: 7.3 %Mason County7.3Ford County: 7.2 %Ford County7.2Knox County: 7.2 %Knox County7.2Ogle County: 7.2 %Ogle County7.2Peoria County: 7.2 %Peoria County7.2Hamilton County: 7.1 %Hamilton County7.1Jefferson County: 7.1 %Jefferson County7.1Jo Daviess County: 7.1 %Jo Daviess County7.1
%. 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

RankCounties2021 (%)Change on 2020
1Douglas County11.5-0.1 pts
2Cass County10.3-0.5 pts
3Cook County10.1-0.2 pts
4Wayne County9.20 pts
5Moultrie County90 pts
6Kane County8.8-1.8 pts
7Iroquois County8.5-0.3 pts
7Winnebago County8.50 pts
9Rock Island County8.4+0.6 pts
9Stark County8.4+0.3 pts
11Boone County8.2-0.1 pts
12Franklin County8.1+0.7 pts
12Gallatin County8.1+0.1 pts
12Pulaski County8.1-0.5 pts
12Schuyler County8.1-0.2 pts
16Fayette County8-0.1 pts
17Jackson County7.9-1.1 pts
17Union County7.9-0.1 pts
19Bureau County7.8+0.5 pts
19Coles County7.8-0.3 pts
19Kankakee County7.8-0.4 pts
19Lake County7.8+0.6 pts
19Warren County7.8-1 pts
24Putnam County7.7+0.5 pts
25Edwards County7.5+0.9 pts
25Henderson County7.50 pts
25Saline County7.5+0.1 pts
28Alexander County7.4+0.3 pts
28DeKalb County7.40 pts
28Hardin County7.4-0.2 pts
28Pike County7.4+0.1 pts
32Carroll County7.3+0.9 pts
32Mason County7.3-0.3 pts
34Ford County7.2-0.1 pts
34Knox County7.2+0.2 pts
34Ogle County7.2+0.3 pts
34Peoria County7.2+0.1 pts
38Hamilton County7.1+0.6 pts
38Jefferson County7.1+0.7 pts
38Jo Daviess County7.1-0.2 pts
38LaSalle County7.10 pts
42Marion County7-0.1 pts
42Massac County7-0.5 pts
42Montgomery County70 pts
42Pope County7-1.1 pts
46Bond County6.9+0.3 pts
46Lawrence County6.9+0.7 pts
46Livingston County6.9+0.1 pts
49Christian County6.8+0.5 pts
49Macoupin County6.8+0.4 pts
49Morgan County6.8+0.5 pts
49Randolph County6.8+1.1 pts
49St. Clair County6.8-0.1 pts
49White County6.8-0.8 pts
49Whiteside County6.8-0.8 pts
56Mercer County6.7+0.5 pts
56Richland County6.7-0.6 pts
56Scott County6.7-0.2 pts
59Clay County6.6-0.9 pts
59Johnson County6.6+0.8 pts
59McDonough County6.6-1.9 pts
59Stephenson County6.6+0.3 pts
59Will County6.6-0.3 pts
64Champaign County6.5-1.1 pts
64Crawford County6.5+0.1 pts
64Cumberland County6.5-0.5 pts
64Greene County6.5-0.4 pts
64Vermilion County6.5-0.2 pts
64Wabash County6.5-0.2 pts
70Lee County6.4+0.5 pts
71Fulton County6.3-0.9 pts
71Marshall County6.3-0.7 pts
71Perry County6.3+0.1 pts
74Calhoun County6.2-1.5 pts
74De Witt County6.2-0.2 pts
74Hancock County6.2-0.1 pts
74Macon County6.2-0.1 pts
74McLean County6.2+0.8 pts
74Sangamon County6.2+0.6 pts
80Clinton County6.1+0.2 pts
80Edgar County6.1-0.1 pts
80Kendall County6.1+0.6 pts
80Williamson County6.1-0.2 pts
84Jasper County6-1.1 pts
85Clark County5.9-0.4 pts
85Madison County5.9-0.3 pts
85McHenry County5.9-0.4 pts
88Adams County5.8-0.4 pts
88DuPage County5.8-0.1 pts
88Henry County5.8-0.7 pts
91Jersey County5.6-0.2 pts
91Tazewell County5.6-0.1 pts
93Logan County5.5-0.2 pts
93Piatt County5.5-0.5 pts
93Shelby County5.5-0.7 pts
96Effingham County5.3-1.4 pts
96Woodford County5.30 pts
98Grundy County5-1 pts
99Menard County4.9-0.8 pts
99Washington County4.9-0.5 pts
101Monroe County4.1-0.1 pts
102Brown County3.8+0.9 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-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, under 65, all races, both sexes, all income levels, states and counties (Counties in Illinois by uninsured rate, under 65 (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, under 65, all races, both sexes, all income levels, states and counties, Counties in Illinois by uninsured rate, under 65 (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-under-65/illinois-counties?period=2021. 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 Illinois by uninsured rate, under 65 (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-under-65/illinois-counties?period=2021.

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 Illinois by uninsured rate, under 65 (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-under-65/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, under 65, all races, both sexes, all income levels, states and counties: Counties in Illinois by uninsured rate, under 65 (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-under-65/illinois-counties?period=2021. 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-2021-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 Illinois by uninsured rate, under 65 (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-under-65/illinois-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/illinois-counties?period=2021.
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-2021-csv.zip. Retrieved 2026-10-12.
ER  -
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Rank Counties in Illinois by uninsured rate, under 65 (US model-based estimate) using official data, and cite the source.
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Questions

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

Douglas County, with 11.5% in 2021, according to the U.S. Census Bureau.

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

Brown County, with 3.8% 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, 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 Illinois: more rankings