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)

Cook County had the highest uninsured rate, under 65 (US model-based estimate) of 102 counties in 2018, at 10.2%. Brown County had the lowest, at 3.7%. The median was 6.3% and the figure for Illinois was 8.1%. Source: the U.S. Census Bureau.

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Highest10.2Cook County
Lowest3.7Brown County
Median6.3102 counties
Illinois8.1History

Map of counties, 2018

Adams County: 5.6 %Alexander County: 6.8 %Bond County: 6.2 %Boone County: 7.5 %Brown County: 3.7 %Bureau County: 7.1 %Calhoun County: 6 %Carroll County: 7 %Cass County: 9.1 %Champaign County: 6.2 %Christian County: 6 %Clark County: 5.8 %Clay County: 6.5 %Clinton County: 5.5 %Coles County: 6.9 %Cook County: 10.2 %Crawford County: 6.1 %Cumberland County: 6.3 %DeKalb County: 6.5 %De Witt County: 5.9 %Douglas County: 10.2 %DuPage County: 6.3 %Edgar County: 6 %Edwards County: 5.8 %Effingham County: 5.8 %Fayette County: 7.8 %Ford County: 6.4 %Franklin County: 6.7 %Fulton County: 6.8 %Gallatin County: 6.1 %Greene County: 7.2 %Grundy County: 4.6 %Hamilton County: 5.8 %Hancock County: 5.9 %Hardin County: 7.7 %Henderson County: 7 %Henry County: 6.1 %Iroquois County: 7.3 %Jackson County: 8.2 %Jasper County: 6.9 %Jefferson County: 6.5 %Jersey County: 5.2 %Jo Daviess County: 6.6 %Johnson County: 6.4 %Kane County: 9.8 %Kankakee County: 6.6 %Kendall County: 5.9 %Knox County: 6.6 %Lake County: 7.4 %LaSalle County: 6.4 %Lawrence County: 6.5 %Lee County: 5.6 %Livingston County: 5.6 %Logan County: 5.8 %McDonough County: 7.4 %McHenry County: 6.8 %McLean County: 5.3 %Macon County: 5.8 %Macoupin County: 5.9 %Madison County: 6.1 %Marion County: 6.8 %Marshall County: 5.9 %Mason County: 6.3 %Massac County: 6.3 %Menard County: 5.2 %Mercer County: 5.3 %Monroe County: 3.8 %Montgomery County: 6 %Morgan County: 5.5 %Moultrie County: 8.6 %Ogle County: 7.5 %Peoria County: 6.9 %Perry County: 5.6 %Piatt County: 5.5 %Pike County: 7.1 %Pope County: 7.6 %Pulaski County: 7.2 %Putnam County: 5.6 %Randolph County: 6 %Richland County: 6.9 %Rock Island County: 7 %St. Clair County: 6.2 %Saline County: 6.5 %Sangamon County: 5.5 %Schuyler County: 7.1 %Scott County: 5.3 %Shelby County: 5.5 %Stark County: 6.2 %Stephenson County: 6.2 %Tazewell County: 5 %Union County: 7.1 %Vermilion County: 6.7 %Wabash County: 6.5 %Warren County: 7.3 %Washington County: 4.7 %Wayne County: 7.4 %White County: 6.7 %Whiteside County: 6.3 %Will County: 6 %Williamson County: 6.2 %Winnebago County: 8 %Woodford County: 5.1 %
  • Under 5.6
  • 5.6 to 6
  • 6 to 6.3
  • 6.3 to 6.7
  • 6.7 to 7.2
  • 7.2 and over
%, 2018. 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, 2018

Cook County: 10.2 %Cook County10.2Douglas County: 10.2 %Douglas County10.2Kane County: 9.8 %Kane County9.8Cass County: 9.1 %Cass County9.1Moultrie County: 8.6 %Moultrie County8.6Jackson County: 8.2 %Jackson County8.2Winnebago County: 8 %Winnebago County8Fayette County: 7.8 %Fayette County7.8Hardin County: 7.7 %Hardin County7.7Pope County: 7.6 %Pope County7.6Boone County: 7.5 %Boone County7.5Ogle County: 7.5 %Ogle County7.5Lake County: 7.4 %Lake County7.4McDonough County: 7.4 %McDonough County7.4Wayne County: 7.4 %Wayne County7.4Iroquois County: 7.3 %Iroquois County7.3Warren County: 7.3 %Warren County7.3Greene County: 7.2 %Greene County7.2Pulaski County: 7.2 %Pulaski County7.2Bureau County: 7.1 %Bureau County7.1Pike County: 7.1 %Pike County7.1Schuyler County: 7.1 %Schuyler County7.1Union County: 7.1 %Union County7.1Carroll County: 7 %Carroll County7Henderson County: 7 %Henderson County7Rock Island County: 7 %Rock Island County7Coles County: 6.9 %Coles County6.9Jasper County: 6.9 %Jasper County6.9Peoria County: 6.9 %Peoria County6.9Richland County: 6.9 %Richland County6.9Alexander County: 6.8 %Alexander County6.8Fulton County: 6.8 %Fulton County6.8Marion County: 6.8 %Marion County6.8McHenry County: 6.8 %McHenry County6.8Franklin County: 6.7 %Franklin County6.7Vermilion County: 6.7 %Vermilion County6.7White County: 6.7 %White County6.7Jo Daviess County: 6.6 %Jo Daviess County6.6Kankakee County: 6.6 %Kankakee County6.6Knox County: 6.6 %Knox County6.6Cook County: 10.2 %Cook County10.2Douglas County: 10.2 %Douglas County10.2Kane County: 9.8 %Kane County9.8Cass County: 9.1 %Cass County9.1Moultrie County: 8.6 %Moultrie County8.6Jackson County: 8.2 %Jackson County8.2Winnebago County: 8 %Winnebago County8Fayette County: 7.8 %Fayette County7.8Hardin County: 7.7 %Hardin County7.7Pope County: 7.6 %Pope County7.6Boone County: 7.5 %Boone County7.5Ogle County: 7.5 %Ogle County7.5Lake County: 7.4 %Lake County7.4McDonough County: 7.4 %McDonough County7.4Wayne County: 7.4 %Wayne County7.4Iroquois County: 7.3 %Iroquois County7.3Warren County: 7.3 %Warren County7.3Greene County: 7.2 %Greene County7.2Pulaski County: 7.2 %Pulaski County7.2Bureau County: 7.1 %Bureau County7.1Pike County: 7.1 %Pike County7.1Schuyler County: 7.1 %Schuyler County7.1Union County: 7.1 %Union County7.1Carroll County: 7 %Carroll County7Henderson County: 7 %Henderson County7Rock Island County: 7 %Rock Island County7Coles County: 6.9 %Coles County6.9Jasper County: 6.9 %Jasper County6.9Peoria County: 6.9 %Peoria County6.9Richland County: 6.9 %Richland County6.9Alexander County: 6.8 %Alexander County6.8Fulton County: 6.8 %Fulton County6.8Marion County: 6.8 %Marion County6.8McHenry County: 6.8 %McHenry County6.8Franklin County: 6.7 %Franklin County6.7Vermilion County: 6.7 %Vermilion County6.7White County: 6.7 %White County6.7Jo Daviess County: 6.6 %Jo Daviess County6.6Kankakee County: 6.6 %Kankakee County6.6Knox County: 6.6 %Knox County6.6
%. 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

RankCounties2018 (%)Change on 2017
1Cook County10.2+0.2 pts
1Douglas County10.2+0.9 pts
3Kane County9.8+0.7 pts
4Cass County9.1+0.6 pts
5Moultrie County8.6+0.6 pts
6Jackson County8.2+0.5 pts
7Winnebago County8+0.6 pts
8Fayette County7.8+0.6 pts
9Hardin County7.7+0.4 pts
10Pope County7.6+0.1 pts
11Boone County7.50 pts
11Ogle County7.5+0.9 pts
13Lake County7.4+0.3 pts
13McDonough County7.4+0.3 pts
13Wayne County7.4+0.7 pts
16Iroquois County7.3-0.4 pts
16Warren County7.3-0.4 pts
18Greene County7.2+0.8 pts
18Pulaski County7.2-0.3 pts
20Bureau County7.1+1 pts
20Pike County7.10 pts
20Schuyler County7.1+0.3 pts
20Union County7.1-0.2 pts
24Carroll County70 pts
24Henderson County7-0.5 pts
24Rock Island County7+0.3 pts
27Coles County6.90 pts
27Jasper County6.9+1.1 pts
27Peoria County6.9+0.6 pts
27Richland County6.9+0.6 pts
31Alexander County6.8+0.4 pts
31Fulton County6.8+0.4 pts
31Marion County6.8+0.6 pts
31McHenry County6.8+0.8 pts
35Franklin County6.7-0.1 pts
35Vermilion County6.7+0.2 pts
35White County6.7+0.6 pts
38Jo Daviess County6.6-0.5 pts
38Kankakee County6.6-0.1 pts
38Knox County6.6+0.8 pts
41Clay County6.5+0.3 pts
41DeKalb County6.5+0.2 pts
41Jefferson County6.5+0.6 pts
41Lawrence County6.5-0.3 pts
41Saline County6.5-0.6 pts
41Wabash County6.5+0.5 pts
47Ford County6.4+0.2 pts
47Johnson County6.4+0.5 pts
47LaSalle County6.4+0.5 pts
50Cumberland County6.3-0.2 pts
50DuPage County6.3-0.1 pts
50Mason County6.30 pts
50Massac County6.3+0.2 pts
50Whiteside County6.3+0.3 pts
55Bond County6.2-0.4 pts
55Champaign County6.2+0.1 pts
55St. Clair County6.20 pts
55Stark County6.2-0.1 pts
55Stephenson County6.2-0.1 pts
55Williamson County6.2+0.8 pts
61Crawford County6.1+0.2 pts
61Gallatin County6.1-0.5 pts
61Henry County6.1-0.1 pts
61Madison County6.1+1.2 pts
65Calhoun County60 pts
65Christian County60 pts
65Edgar County60 pts
65Montgomery County60 pts
65Randolph County6+0.5 pts
65Will County6-0.3 pts
71De Witt County5.9+0.7 pts
71Hancock County5.9+0.3 pts
71Kendall County5.9+0.6 pts
71Macoupin County5.9-0.1 pts
71Marshall County5.90 pts
76Clark County5.8-0.1 pts
76Edwards County5.80 pts
76Effingham County5.8+0.2 pts
76Hamilton County5.8+0.1 pts
76Logan County5.8+0.5 pts
76Macon County5.8+0.3 pts
82Adams County5.6+0.4 pts
82Lee County5.6-0.2 pts
82Livingston County5.6-0.1 pts
82Perry County5.6-0.1 pts
82Putnam County5.6-0.2 pts
87Clinton County5.5+0.7 pts
87Morgan County5.5+0.3 pts
87Piatt County5.5+0.8 pts
87Sangamon County5.50 pts
87Shelby County5.5+0.4 pts
92McLean County5.3+0.2 pts
92Mercer County5.30 pts
92Scott County5.3+0.3 pts
95Jersey County5.2+0.2 pts
95Menard County5.2-0.2 pts
97Woodford County5.1+0.6 pts
98Tazewell County5+0.4 pts
99Washington County4.7-0.6 pts
100Grundy County4.6-0.4 pts
101Monroe County3.8+0.1 pts
102Brown County3.7+0.1 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-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, under 65, all races, both sexes, all income levels, states and counties (Counties in Illinois by uninsured rate, under 65 (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, under 65, all races, both sexes, all income levels, states and counties, Counties in Illinois by uninsured rate, under 65 (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-under-65/illinois-counties?period=2018. 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), 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-under-65/illinois-counties?period=2018.

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), 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-under-65/illinois-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2018,
  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), 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-under-65/illinois-counties?period=2018. 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-2018-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), 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-under-65/illinois-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/illinois-counties?period=2018.
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-2018-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)?

Cook County, with 10.2% in 2018, according to the U.S. Census Bureau.

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

Brown County, with 3.7% 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, 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