Data / Rankings / Uninsured rate, ages 35 to 64 (US, ACS) / Counties in Illinois

Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS)

Alexander County had the highest uninsured rate, ages 35 to 64 (US, ACS) of 102 counties in 2021, at 19.8%. Calhoun County had the lowest, at 1.6%. The median was 7% and the figure for Illinois was 9%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest19.8Alexander County
Lowest1.6Calhoun County
Median7102 counties
Illinois9History

Map of counties, 2021

Adams County: 5.8 %Alexander County: 19.8 %Bond County: 5.8 %Boone County: 8.4 %Brown County: 9.1 %Bureau County: 6.5 %Calhoun County: 1.6 %Carroll County: 7.4 %Cass County: 8.1 %Champaign County: 6.2 %Christian County: 6.4 %Clark County: 6.4 %Clay County: 10.7 %Clinton County: 6.5 %Coles County: 9 %Cook County: 11.9 %Crawford County: 8.7 %Cumberland County: 7.9 %DeKalb County: 6 %De Witt County: 5.6 %Douglas County: 13.1 %DuPage County: 6.4 %Edgar County: 7.2 %Edwards County: 10 %Effingham County: 6.6 %Fayette County: 10.2 %Ford County: 7.1 %Franklin County: 8.1 %Fulton County: 8 %Gallatin County: 5.6 %Greene County: 9.4 %Grundy County: 4.9 %Hamilton County: 7.2 %Hancock County: 5.4 %Hardin County: 9.6 %Henderson County: 6 %Henry County: 7.3 %Iroquois County: 6.8 %Jackson County: 9.8 %Jasper County: 10.7 %Jefferson County: 7.6 %Jersey County: 7.1 %Jo Daviess County: 6.5 %Johnson County: 8.8 %Kane County: 10.5 %Kankakee County: 7 %Kendall County: 3.5 %Knox County: 7.1 %Lake County: 8.5 %LaSalle County: 5.4 %Lawrence County: 11.5 %Lee County: 5.4 %Livingston County: 5.7 %Logan County: 3.9 %McDonough County: 7.2 %McHenry County: 5.9 %McLean County: 4.9 %Macon County: 5.7 %Macoupin County: 5.1 %Madison County: 6.1 %Marion County: 9.7 %Marshall County: 6.2 %Mason County: 7.6 %Massac County: 8.5 %Menard County: 3.2 %Mercer County: 6 %Monroe County: 2.8 %Montgomery County: 5.6 %Morgan County: 6.3 %Moultrie County: 12.2 %Ogle County: 6 %Peoria County: 8.1 %Perry County: 4.8 %Piatt County: 5.8 %Pike County: 9.6 %Pope County: 3.4 %Pulaski County: 11.3 %Putnam County: 5.6 %Randolph County: 7.3 %Richland County: 5.2 %Rock Island County: 7.6 %St. Clair County: 6.9 %Saline County: 7 %Sangamon County: 5 %Schuyler County: 10.1 %Scott County: 6.1 %Shelby County: 6.3 %Stark County: 9.1 %Stephenson County: 6.3 %Tazewell County: 5.8 %Union County: 7.8 %Vermilion County: 7.8 %Wabash County: 8.8 %Warren County: 10.2 %Washington County: 2.7 %Wayne County: 10.2 %White County: 10 %Whiteside County: 7.8 %Will County: 6.6 %Williamson County: 7.3 %Winnebago County: 8.6 %Woodford County: 4.4 %
  • Under 5.5
  • 5.5 to 6.2
  • 6.2 to 7
  • 7 to 7.9
  • 7.9 to 9.6
  • 9.6 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Alexander County: 19.8 %Alexander County19.8Douglas County: 13.1 %Douglas County13.1Moultrie County: 12.2 %Moultrie County12.2Cook County: 11.9 %Cook County11.9Lawrence County: 11.5 %Lawrence County11.5Pulaski County: 11.3 %Pulaski County11.3Clay County: 10.7 %Clay County10.7Jasper County: 10.7 %Jasper County10.7Kane County: 10.5 %Kane County10.5Fayette County: 10.2 %Fayette County10.2Warren County: 10.2 %Warren County10.2Wayne County: 10.2 %Wayne County10.2Schuyler County: 10.1 %Schuyler County10.1White County: 10 %White County10Edwards County: 10 %Edwards County10Jackson County: 9.8 %Jackson County9.8Marion County: 9.7 %Marion County9.7Hardin County: 9.6 %Hardin County9.6Pike County: 9.6 %Pike County9.6Greene County: 9.4 %Greene County9.4Stark County: 9.1 %Stark County9.1Brown County: 9.1 %Brown County9.1Coles County: 9 %Coles County9Johnson County: 8.8 %Johnson County8.8Wabash County: 8.8 %Wabash County8.8Crawford County: 8.7 %Crawford County8.7Winnebago County: 8.6 %Winnebago County8.6Massac County: 8.5 %Massac County8.5Lake County: 8.5 %Lake County8.5Boone County: 8.4 %Boone County8.4Franklin County: 8.1 %Franklin County8.1Cass County: 8.1 %Cass County8.1Peoria County: 8.1 %Peoria County8.1Fulton County: 8 %Fulton County8Cumberland County: 7.9 %Cumberland County7.9Vermilion County: 7.8 %Vermilion County7.8Whiteside County: 7.8 %Whiteside County7.8Union County: 7.8 %Union County7.8Jefferson County: 7.6 %Jefferson County7.6Rock Island County: 7.6 %Rock Island County7.6Alexander County: 19.8 %Alexander County19.8Douglas County: 13.1 %Douglas County13.1Moultrie County: 12.2 %Moultrie County12.2Cook County: 11.9 %Cook County11.9Lawrence County: 11.5 %Lawrence County11.5Pulaski County: 11.3 %Pulaski County11.3Clay County: 10.7 %Clay County10.7Jasper County: 10.7 %Jasper County10.7Kane County: 10.5 %Kane County10.5Fayette County: 10.2 %Fayette County10.2Warren County: 10.2 %Warren County10.2Wayne County: 10.2 %Wayne County10.2Schuyler County: 10.1 %Schuyler County10.1White County: 10 %White County10Edwards County: 10 %Edwards County10Jackson County: 9.8 %Jackson County9.8Marion County: 9.7 %Marion County9.7Hardin County: 9.6 %Hardin County9.6Pike County: 9.6 %Pike County9.6Greene County: 9.4 %Greene County9.4Stark County: 9.1 %Stark County9.1Brown County: 9.1 %Brown County9.1Coles County: 9 %Coles County9Johnson County: 8.8 %Johnson County8.8Wabash County: 8.8 %Wabash County8.8Crawford County: 8.7 %Crawford County8.7Winnebago County: 8.6 %Winnebago County8.6Massac County: 8.5 %Massac County8.5Lake County: 8.5 %Lake County8.5Boone County: 8.4 %Boone County8.4Franklin County: 8.1 %Franklin County8.1Cass County: 8.1 %Cass County8.1Peoria County: 8.1 %Peoria County8.1Fulton County: 8 %Fulton County8Cumberland County: 7.9 %Cumberland County7.9Vermilion County: 7.8 %Vermilion County7.8Whiteside County: 7.8 %Whiteside County7.8Union County: 7.8 %Union County7.8Jefferson County: 7.6 %Jefferson County7.6Rock Island County: 7.6 %Rock Island County7.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Alexander County19.8
2Douglas County13.1
3Moultrie County12.2
4Cook County11.9
5Lawrence County11.5
6Pulaski County11.3
7Clay County10.7
8Jasper County10.7
9Kane County10.5
10Fayette County10.2
11Warren County10.2
12Wayne County10.2
13Schuyler County10.1
14White County10
15Edwards County10
16Jackson County9.8
17Marion County9.7
18Hardin County9.6
19Pike County9.6
20Greene County9.4
21Stark County9.1
22Brown County9.1
23Coles County9
24Johnson County8.8
25Wabash County8.8
26Crawford County8.7
27Winnebago County8.6
28Massac County8.5
29Lake County8.5
30Boone County8.4
31Franklin County8.1
32Cass County8.1
33Peoria County8.1
34Fulton County8
35Cumberland County7.9
36Vermilion County7.8
37Whiteside County7.8
38Union County7.8
39Jefferson County7.6
40Rock Island County7.6
41Mason County7.6
42Carroll County7.4
43Henry County7.3
43Williamson County7.3
45Randolph County7.3
46Edgar County7.2
46McDonough County7.2
48Hamilton County7.2
49Jersey County7.1
50Ford County7.1
51Knox County7.1
52Kankakee County7
53Saline County7
54St. Clair County6.9
55Iroquois County6.8
56Will County6.6
57Effingham County6.6
58Bureau County6.5
59Clinton County6.5
60Jo Daviess County6.5
61Clark County6.4
62Christian County6.4
62DuPage County6.4
64Shelby County6.3
65Stephenson County6.3
66Morgan County6.3
67Champaign County6.2
68Marshall County6.2
69Madison County6.1
70Scott County6.1
71Mercer County6
71Ogle County6
73DeKalb County6
74Henderson County6
75McHenry County5.9
76Tazewell County5.8
77Bond County5.8
77Piatt County5.8
79Adams County5.8
80Macon County5.7
81Livingston County5.7
82Gallatin County5.6
82Montgomery County5.6
82Putnam County5.6
85De Witt County5.6
86Lee County5.4
87LaSalle County5.4
88Hancock County5.4
89Richland County5.2
90Macoupin County5.1
91Sangamon County5
92McLean County4.9
93Grundy County4.9
94Perry County4.8
95Woodford County4.4
96Logan County3.9
97Kendall County3.5
98Pope County3.4
99Menard County3.2
100Monroe County2.8
101Washington County2.7
102Calhoun County1.6

Other periods

About this ranking

People aged 35 to 64 without health insurance coverage of any kind, as a percentage of the civilian noninstitutionalized population aged 35 to 64. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Coverage is what people reported at the interview, so the five-year figure averages five years of answers. People whose only coverage is the Indian Health Service count as uninsured. Active-duty military and people living in institutions are outside the universe. For single-year model-based county figures under 65, see uninsured_rate_under_65, uninsured_rate_18_64 and uninsured_rate_under_19 (SAHIE), a different source.

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. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. 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). American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs (Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat

MLA 9

American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs, Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS), 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/illinois-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/illinois-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs, Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-35-64/illinois-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs: Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS), 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/illinois-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs: Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS), 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat
L2  - https://invokely.ai/rankings/uninsured-rate-ages-35-64/illinois-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/illinois-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Illinois by uninsured rate, ages 35 to 64 (US, ACS) using official data, and cite the source.
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Questions

Which county has the highest uninsured rate, ages 35 to 64 (US, ACS)?

Alexander County, with 19.8% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 35 to 64 (US, ACS)?

Calhoun County, with 1.6% 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, American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. Retrieved 2026-10-12.

Uninsured rate, ages 35 to 64 (US, ACS): other rankings

Counties in Illinois: more rankings