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 2018, at 12.4%. Brown County had the lowest, at 4.3%. The median was 7.6% and the figure for Illinois was 9.9%. Source: the U.S. Census Bureau.

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Highest12.4Cook County
Lowest4.3Brown County
Median7.6102 counties
Illinois9.9History

Map of counties, 2018

Adams County: 6.8 %Alexander County: 8.6 %Bond County: 7.4 %Boone County: 9.3 %Brown County: 4.3 %Bureau County: 8.3 %Calhoun County: 7.1 %Carroll County: 8.1 %Cass County: 11.2 %Champaign County: 7.3 %Christian County: 7.2 %Clark County: 7 %Clay County: 8 %Clinton County: 6.5 %Coles County: 8.1 %Cook County: 12.4 %Crawford County: 7.3 %Cumberland County: 7.4 %DeKalb County: 7.9 %De Witt County: 7.1 %Douglas County: 12.2 %DuPage County: 7.6 %Edgar County: 7.1 %Edwards County: 6.8 %Effingham County: 7.1 %Fayette County: 9.5 %Ford County: 7.7 %Franklin County: 8.2 %Fulton County: 8.2 %Gallatin County: 7.3 %Greene County: 8.8 %Grundy County: 5.5 %Hamilton County: 7.1 %Hancock County: 7 %Hardin County: 9.1 %Henderson County: 8 %Henry County: 7.4 %Iroquois County: 8.7 %Jackson County: 9.6 %Jasper County: 8.5 %Jefferson County: 8.1 %Jersey County: 6.1 %Jo Daviess County: 7.7 %Johnson County: 7.5 %Kane County: 12.2 %Kankakee County: 8.2 %Kendall County: 7.4 %Knox County: 8.1 %Lake County: 9.1 %LaSalle County: 7.7 %Lawrence County: 7.9 %Lee County: 6.7 %Livingston County: 6.6 %Logan County: 7 %McDonough County: 8.8 %McHenry County: 8.5 %McLean County: 6.5 %Macon County: 7.1 %Macoupin County: 7.1 %Madison County: 7.3 %Marion County: 8.3 %Marshall County: 6.9 %Mason County: 7.5 %Massac County: 7.7 %Menard County: 6.1 %Mercer County: 6.3 %Monroe County: 4.5 %Montgomery County: 7.3 %Morgan County: 6.5 %Moultrie County: 10 %Ogle County: 9 %Peoria County: 8.6 %Perry County: 6.8 %Piatt County: 6.6 %Pike County: 8.5 %Pope County: 8.4 %Pulaski County: 8.8 %Putnam County: 6.5 %Randolph County: 7.2 %Richland County: 8.5 %Rock Island County: 8.5 %St. Clair County: 7.6 %Saline County: 7.7 %Sangamon County: 6.7 %Schuyler County: 8.4 %Scott County: 6.3 %Shelby County: 6.5 %Stark County: 7.4 %Stephenson County: 7.4 %Tazewell County: 6.2 %Union County: 8.5 %Vermilion County: 8.4 %Wabash County: 7.8 %Warren County: 8.9 %Washington County: 5.5 %Wayne County: 8.8 %White County: 8 %Whiteside County: 7.6 %Will County: 7.4 %Williamson County: 7.6 %Winnebago County: 9.8 %Woodford County: 6.2 %
  • Under 6.7
  • 6.7 to 7.2
  • 7.2 to 7.6
  • 7.6 to 8.1
  • 8.1 to 8.7
  • 8.7 and over
%, 2018. 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, 2018

Cook County: 12.4 %Cook County12.4Douglas County: 12.2 %Douglas County12.2Kane County: 12.2 %Kane County12.2Cass County: 11.2 %Cass County11.2Moultrie County: 10 %Moultrie County10Winnebago County: 9.8 %Winnebago County9.8Jackson County: 9.6 %Jackson County9.6Fayette County: 9.5 %Fayette County9.5Boone County: 9.3 %Boone County9.3Hardin County: 9.1 %Hardin County9.1Lake County: 9.1 %Lake County9.1Ogle County: 9 %Ogle County9Warren County: 8.9 %Warren County8.9Greene County: 8.8 %Greene County8.8McDonough County: 8.8 %McDonough County8.8Pulaski County: 8.8 %Pulaski County8.8Wayne County: 8.8 %Wayne County8.8Iroquois County: 8.7 %Iroquois County8.7Alexander County: 8.6 %Alexander County8.6Peoria County: 8.6 %Peoria County8.6Jasper County: 8.5 %Jasper County8.5McHenry County: 8.5 %McHenry County8.5Pike County: 8.5 %Pike County8.5Richland County: 8.5 %Richland County8.5Rock Island County: 8.5 %Rock Island County8.5Union County: 8.5 %Union County8.5Pope County: 8.4 %Pope County8.4Schuyler County: 8.4 %Schuyler County8.4Vermilion County: 8.4 %Vermilion County8.4Bureau County: 8.3 %Bureau County8.3Marion County: 8.3 %Marion County8.3Franklin County: 8.2 %Franklin County8.2Fulton County: 8.2 %Fulton County8.2Kankakee County: 8.2 %Kankakee County8.2Carroll County: 8.1 %Carroll County8.1Coles County: 8.1 %Coles County8.1Jefferson County: 8.1 %Jefferson County8.1Knox County: 8.1 %Knox County8.1Clay County: 8 %Clay County8Henderson County: 8 %Henderson County8Cook County: 12.4 %Cook County12.4Douglas County: 12.2 %Douglas County12.2Kane County: 12.2 %Kane County12.2Cass County: 11.2 %Cass County11.2Moultrie County: 10 %Moultrie County10Winnebago County: 9.8 %Winnebago County9.8Jackson County: 9.6 %Jackson County9.6Fayette County: 9.5 %Fayette County9.5Boone County: 9.3 %Boone County9.3Hardin County: 9.1 %Hardin County9.1Lake County: 9.1 %Lake County9.1Ogle County: 9 %Ogle County9Warren County: 8.9 %Warren County8.9Greene County: 8.8 %Greene County8.8McDonough County: 8.8 %McDonough County8.8Pulaski County: 8.8 %Pulaski County8.8Wayne County: 8.8 %Wayne County8.8Iroquois County: 8.7 %Iroquois County8.7Alexander County: 8.6 %Alexander County8.6Peoria County: 8.6 %Peoria County8.6Jasper County: 8.5 %Jasper County8.5McHenry County: 8.5 %McHenry County8.5Pike County: 8.5 %Pike County8.5Richland County: 8.5 %Richland County8.5Rock Island County: 8.5 %Rock Island County8.5Union County: 8.5 %Union County8.5Pope County: 8.4 %Pope County8.4Schuyler County: 8.4 %Schuyler County8.4Vermilion County: 8.4 %Vermilion County8.4Bureau County: 8.3 %Bureau County8.3Marion County: 8.3 %Marion County8.3Franklin County: 8.2 %Franklin County8.2Fulton County: 8.2 %Fulton County8.2Kankakee County: 8.2 %Kankakee County8.2Carroll County: 8.1 %Carroll County8.1Coles County: 8.1 %Coles County8.1Jefferson County: 8.1 %Jefferson County8.1Knox County: 8.1 %Knox County8.1Clay County: 8 %Clay County8Henderson County: 8 %Henderson County8
%. 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

RankCounties2018 (%)Change on 2017
1Cook County12.4+0.1 pts
2Douglas County12.2+0.9 pts
2Kane County12.2+0.5 pts
4Cass County11.2+0.7 pts
5Moultrie County100 pts
6Winnebago County9.8+0.6 pts
7Jackson County9.6+0.5 pts
8Fayette County9.5+0.6 pts
9Boone County9.30 pts
10Hardin County9.1+0.5 pts
10Lake County9.1+0.3 pts
12Ogle County9+1 pts
13Warren County8.9-0.7 pts
14Greene County8.8+1.1 pts
14McDonough County8.8+0.3 pts
14Pulaski County8.8-0.3 pts
14Wayne County8.8+0.5 pts
18Iroquois County8.7-0.8 pts
19Alexander County8.6+0.4 pts
19Peoria County8.6+0.8 pts
21Jasper County8.5+1.4 pts
21McHenry County8.5+1.2 pts
21Pike County8.5-0.1 pts
21Richland County8.5+0.6 pts
21Rock Island County8.5+0.2 pts
21Union County8.5-0.4 pts
27Pope County8.40 pts
27Schuyler County8.4+0.2 pts
27Vermilion County8.4+0.2 pts
30Bureau County8.3+0.9 pts
30Marion County8.3+0.5 pts
32Franklin County8.2-0.3 pts
32Fulton County8.2+0.4 pts
32Kankakee County8.2-0.1 pts
35Carroll County8.1-0.3 pts
35Coles County8.1-0.2 pts
35Jefferson County8.1+0.9 pts
35Knox County8.1+1 pts
39Clay County8+0.3 pts
39Henderson County8-0.7 pts
39White County8+0.6 pts
42DeKalb County7.9+0.1 pts
42Lawrence County7.9-0.4 pts
44Wabash County7.8+0.5 pts
45Ford County7.7+0.1 pts
45Jo Daviess County7.7-0.8 pts
45LaSalle County7.7+0.4 pts
45Massac County7.7+0.1 pts
45Saline County7.7-0.9 pts
50DuPage County7.6-0.1 pts
50St. Clair County7.6-0.2 pts
50Whiteside County7.6+0.2 pts
50Williamson County7.6+1 pts
54Johnson County7.5+0.5 pts
54Mason County7.50 pts
56Bond County7.4-0.5 pts
56Cumberland County7.4-0.4 pts
56Henry County7.4-0.3 pts
56Kendall County7.4+0.7 pts
56Stark County7.4-0.2 pts
56Stephenson County7.4-0.4 pts
56Will County7.4-0.5 pts
63Champaign County7.3+0.1 pts
63Crawford County7.3+0.2 pts
63Gallatin County7.3-0.7 pts
63Madison County7.3+1.3 pts
63Montgomery County7.30 pts
68Christian County7.2-0.1 pts
68Randolph County7.2+0.5 pts
70Calhoun County7.10 pts
70De Witt County7.1+0.8 pts
70Edgar County7.1-0.1 pts
70Effingham County7.1+0.2 pts
70Hamilton County7.1+0.1 pts
70Macon County7.1+0.2 pts
70Macoupin County7.1-0.1 pts
77Clark County7-0.2 pts
77Hancock County7+0.3 pts
77Logan County7+0.6 pts
80Marshall County6.90 pts
81Adams County6.8+0.4 pts
81Edwards County6.8-0.3 pts
81Perry County6.8-0.2 pts
84Lee County6.7-0.3 pts
84Sangamon County6.70 pts
86Livingston County6.6-0.3 pts
86Piatt County6.6+0.9 pts
88Clinton County6.5+0.8 pts
88McLean County6.5+0.3 pts
88Morgan County6.5+0.2 pts
88Putnam County6.5-0.3 pts
88Shelby County6.5+0.3 pts
93Mercer County6.3-0.2 pts
93Scott County6.3+0.4 pts
95Tazewell County6.2+0.5 pts
95Woodford County6.2+0.7 pts
97Jersey County6.10 pts
97Menard County6.1-0.4 pts
99Grundy County5.5-0.7 pts
99Washington County5.5-0.9 pts
101Monroe County4.5+0.1 pts
102Brown County4.3-0.1 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-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, 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), 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, 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), 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-ages-18-64/illinois-counties?period=2018. 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), 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-ages-18-64/illinois-counties?period=2018.

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), 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-ages-18-64/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, 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), 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-ages-18-64/illinois-counties?period=2018. 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-2018-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), 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-ages-18-64/illinois-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/illinois-counties?period=2018.
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-2018-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 12.4% in 2018, 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 4.3% 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, 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