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)

Cook County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 102 counties in 2015, at 13.4%. Monroe County had the lowest, at 4.6%. The median was 7.3% and the figure for Illinois was 10.2%. Source: the U.S. Census Bureau.

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Highest13.4Cook County
Lowest4.6Monroe County
Median7.3102 counties
Illinois10.2History

Map of counties, 2015

Adams County: 6.7 %Alexander County: 8.8 %Bond County: 7.2 %Boone County: 9.7 %Brown County: 5.6 %Bureau County: 7.7 %Calhoun County: 6.6 %Carroll County: 7.5 %Cass County: 10.1 %Champaign County: 7.8 %Christian County: 6.7 %Clark County: 6.5 %Clay County: 7.5 %Clinton County: 5.7 %Coles County: 7.3 %Cook County: 13.4 %Crawford County: 6.5 %Cumberland County: 7.1 %DeKalb County: 8.6 %De Witt County: 5.7 %Douglas County: 11.2 %DuPage County: 7.1 %Edgar County: 7.9 %Edwards County: 7.2 %Effingham County: 5.7 %Fayette County: 9.4 %Ford County: 7.7 %Franklin County: 9.1 %Fulton County: 7.9 %Gallatin County: 8.3 %Greene County: 7.7 %Grundy County: 5.9 %Hamilton County: 7.5 %Hancock County: 6.9 %Hardin County: 8.3 %Henderson County: 7.4 %Henry County: 6.9 %Iroquois County: 9.1 %Jackson County: 8.4 %Jasper County: 7.7 %Jefferson County: 6.8 %Jersey County: 5.9 %Jo Daviess County: 7.2 %Johnson County: 6.4 %Kane County: 13 %Kankakee County: 8.8 %Kendall County: 6 %Knox County: 7.3 %Lake County: 10.3 %LaSalle County: 7.8 %Lawrence County: 7.1 %Lee County: 6.5 %Livingston County: 6.8 %Logan County: 5.6 %McDonough County: 7.9 %McHenry County: 7.3 %McLean County: 5.6 %Macon County: 7.3 %Macoupin County: 7.3 %Madison County: 6.9 %Marion County: 7.8 %Marshall County: 6.1 %Mason County: 7.9 %Massac County: 7.6 %Menard County: 5.7 %Mercer County: 6 %Monroe County: 4.6 %Montgomery County: 6.9 %Morgan County: 6.4 %Moultrie County: 8.8 %Ogle County: 7.6 %Peoria County: 7.1 %Perry County: 6.9 %Piatt County: 5.6 %Pike County: 8.3 %Pope County: 8.1 %Pulaski County: 8.7 %Putnam County: 6.5 %Randolph County: 6.4 %Richland County: 6.9 %Rock Island County: 7.9 %St. Clair County: 7.9 %Saline County: 7.4 %Sangamon County: 6.1 %Schuyler County: 8.3 %Scott County: 6.4 %Shelby County: 7.2 %Stark County: 7 %Stephenson County: 7.2 %Tazewell County: 5.3 %Union County: 8.5 %Vermilion County: 7.8 %Wabash County: 6.9 %Warren County: 9.4 %Washington County: 6.1 %Wayne County: 7.6 %White County: 7.1 %Whiteside County: 7.9 %Will County: 7.5 %Williamson County: 6.8 %Winnebago County: 9 %Woodford County: 5.2 %
  • Under 6.1
  • 6.1 to 6.9
  • 6.9 to 7.3
  • 7.3 to 7.7
  • 7.7 to 8.4
  • 8.4 and over
%, 2015. 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, 2015

Cook County: 13.4 %Cook County13.4Kane County: 13 %Kane County13Douglas County: 11.2 %Douglas County11.2Lake County: 10.3 %Lake County10.3Cass County: 10.1 %Cass County10.1Boone County: 9.7 %Boone County9.7Fayette County: 9.4 %Fayette County9.4Warren County: 9.4 %Warren County9.4Franklin County: 9.1 %Franklin County9.1Iroquois County: 9.1 %Iroquois County9.1Winnebago County: 9 %Winnebago County9Alexander County: 8.8 %Alexander County8.8Kankakee County: 8.8 %Kankakee County8.8Moultrie County: 8.8 %Moultrie County8.8Pulaski County: 8.7 %Pulaski County8.7DeKalb County: 8.6 %DeKalb County8.6Union County: 8.5 %Union County8.5Jackson County: 8.4 %Jackson County8.4Gallatin County: 8.3 %Gallatin County8.3Hardin County: 8.3 %Hardin County8.3Pike County: 8.3 %Pike County8.3Schuyler County: 8.3 %Schuyler County8.3Pope County: 8.1 %Pope County8.1Edgar County: 7.9 %Edgar County7.9Fulton County: 7.9 %Fulton County7.9Mason County: 7.9 %Mason County7.9McDonough County: 7.9 %McDonough County7.9Rock Island County: 7.9 %Rock Island County7.9St. Clair County: 7.9 %St. Clair County7.9Whiteside County: 7.9 %Whiteside County7.9Champaign County: 7.8 %Champaign County7.8LaSalle County: 7.8 %LaSalle County7.8Marion County: 7.8 %Marion County7.8Vermilion County: 7.8 %Vermilion County7.8Bureau County: 7.7 %Bureau County7.7Ford County: 7.7 %Ford County7.7Greene County: 7.7 %Greene County7.7Jasper County: 7.7 %Jasper County7.7Massac County: 7.6 %Massac County7.6Ogle County: 7.6 %Ogle County7.6Cook County: 13.4 %Cook County13.4Kane County: 13 %Kane County13Douglas County: 11.2 %Douglas County11.2Lake County: 10.3 %Lake County10.3Cass County: 10.1 %Cass County10.1Boone County: 9.7 %Boone County9.7Fayette County: 9.4 %Fayette County9.4Warren County: 9.4 %Warren County9.4Franklin County: 9.1 %Franklin County9.1Iroquois County: 9.1 %Iroquois County9.1Winnebago County: 9 %Winnebago County9Alexander County: 8.8 %Alexander County8.8Kankakee County: 8.8 %Kankakee County8.8Moultrie County: 8.8 %Moultrie County8.8Pulaski County: 8.7 %Pulaski County8.7DeKalb County: 8.6 %DeKalb County8.6Union County: 8.5 %Union County8.5Jackson County: 8.4 %Jackson County8.4Gallatin County: 8.3 %Gallatin County8.3Hardin County: 8.3 %Hardin County8.3Pike County: 8.3 %Pike County8.3Schuyler County: 8.3 %Schuyler County8.3Pope County: 8.1 %Pope County8.1Edgar County: 7.9 %Edgar County7.9Fulton County: 7.9 %Fulton County7.9Mason County: 7.9 %Mason County7.9McDonough County: 7.9 %McDonough County7.9Rock Island County: 7.9 %Rock Island County7.9St. Clair County: 7.9 %St. Clair County7.9Whiteside County: 7.9 %Whiteside County7.9Champaign County: 7.8 %Champaign County7.8LaSalle County: 7.8 %LaSalle County7.8Marion County: 7.8 %Marion County7.8Vermilion County: 7.8 %Vermilion County7.8Bureau County: 7.7 %Bureau County7.7Ford County: 7.7 %Ford County7.7Greene County: 7.7 %Greene County7.7Jasper County: 7.7 %Jasper County7.7Massac County: 7.6 %Massac County7.6Ogle County: 7.6 %Ogle County7.6
%. 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

RankCounties2015 (%)Change on 2014
1Cook County13.4-4.3 pts
2Kane County13-2.7 pts
3Douglas County11.2-3.7 pts
4Lake County10.3-2.3 pts
5Cass County10.1-4.8 pts
6Boone County9.7-3.9 pts
7Fayette County9.4-3.6 pts
7Warren County9.4-2.9 pts
9Franklin County9.1-3.5 pts
9Iroquois County9.1-3.4 pts
11Winnebago County9-4.6 pts
12Alexander County8.8-4.9 pts
12Kankakee County8.8-3.5 pts
12Moultrie County8.8-3.6 pts
15Pulaski County8.7-3.8 pts
16DeKalb County8.6-2.5 pts
17Union County8.5-4.2 pts
18Jackson County8.4-5.1 pts
19Gallatin County8.3-4.1 pts
19Hardin County8.3-3.5 pts
19Pike County8.3-5.1 pts
19Schuyler County8.3-4 pts
23Pope County8.1-4.3 pts
24Edgar County7.9-3.1 pts
24Fulton County7.9-4.2 pts
24Mason County7.9-3.8 pts
24McDonough County7.9-2.9 pts
24Rock Island County7.9-5.2 pts
24St. Clair County7.9-3.5 pts
24Whiteside County7.9-2.8 pts
31Champaign County7.8-3.3 pts
31LaSalle County7.8-3.2 pts
31Marion County7.8-4 pts
31Vermilion County7.8-3.6 pts
35Bureau County7.7-4 pts
35Ford County7.7-3.2 pts
35Greene County7.7-3.6 pts
35Jasper County7.7-3 pts
39Massac County7.6-3.6 pts
39Ogle County7.6-3.6 pts
39Wayne County7.6-3.9 pts
42Carroll County7.5-4 pts
42Clay County7.5-3.3 pts
42Hamilton County7.5-4.1 pts
42Will County7.5-4.1 pts
46Henderson County7.4-4.1 pts
46Saline County7.4-5.3 pts
48Coles County7.3-3.4 pts
48Knox County7.3-4.4 pts
48Macon County7.3-3.1 pts
48Macoupin County7.3-2.8 pts
48McHenry County7.3-3.7 pts
53Bond County7.2-4 pts
53Edwards County7.2-3.7 pts
53Jo Daviess County7.2-4 pts
53Shelby County7.2-3.3 pts
53Stephenson County7.2-2.9 pts
58Cumberland County7.1-2.7 pts
58DuPage County7.1-3.5 pts
58Lawrence County7.1-3.8 pts
58Peoria County7.1-4.2 pts
58White County7.1-4.2 pts
63Stark County7-3.9 pts
64Hancock County6.9-3.7 pts
64Henry County6.9-2.6 pts
64Madison County6.9-2.8 pts
64Montgomery County6.9-2.9 pts
64Perry County6.9-3.8 pts
64Richland County6.9-3.1 pts
64Wabash County6.9-3.4 pts
71Jefferson County6.8-3.3 pts
71Livingston County6.8-2.6 pts
71Williamson County6.8-4.4 pts
74Adams County6.7-3.5 pts
74Christian County6.7-3.9 pts
76Calhoun County6.6-3.6 pts
77Clark County6.5-4 pts
77Crawford County6.5-4 pts
77Lee County6.5-3.8 pts
77Putnam County6.5-3.2 pts
81Johnson County6.4-3.9 pts
81Morgan County6.4-4.3 pts
81Randolph County6.4-3.8 pts
81Scott County6.4-4.9 pts
85Marshall County6.1-3.8 pts
85Sangamon County6.1-3.5 pts
85Washington County6.1-2.4 pts
88Kendall County6-2.7 pts
88Mercer County6-2.7 pts
90Grundy County5.9-3.7 pts
90Jersey County5.9-4.2 pts
92Clinton County5.7-3.4 pts
92De Witt County5.7-3.8 pts
92Effingham County5.7-3.7 pts
92Menard County5.7-3.3 pts
96Brown County5.6-2.9 pts
96Logan County5.6-3.6 pts
96McLean County5.6-2.4 pts
96Piatt County5.6-2.6 pts
100Tazewell County5.3-2.6 pts
101Woodford County5.2-2.4 pts
102Monroe County4.6-2.7 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-2015-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), 2015) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-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), 2015. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2015. 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), 2015. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2015.

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), 2015 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2015,
  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), 2015}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2015. 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-2015-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), 2015
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-2015-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2015.
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-2015-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)?

Cook County, with 13.4% in 2015, according to the U.S. Census Bureau.

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

Monroe County, with 4.6% in 2015.

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