Data / Rankings / Diagnosed diabetes in adults, local model estimate / Counties in Illinois

Counties in Illinois by diagnosed diabetes in adults, local model estimate

Alexander County had the highest diagnosed diabetes in adults, local model estimate of 102 counties in 2021, at 18.4%. Kendall County had the lowest, at 8.5%. The median was 11.8%. Source: the Centers for Disease Control and Prevention.

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Highest18.4Alexander County
Lowest8.5Kendall County
Median11.8102 counties

Map of counties, 2021

Adams County: 11.4 %Alexander County: 18.4 %Bond County: 12.1 %Boone County: 11 %Brown County: 10.7 %Bureau County: 12.6 %Calhoun County: 11.5 %Carroll County: 12.8 %Cass County: 12.7 %Champaign County: 9 %Christian County: 11.8 %Clark County: 10.8 %Clay County: 12.6 %Clinton County: 10.3 %Coles County: 10.6 %Cook County: 11.2 %Crawford County: 11.4 %Cumberland County: 11.2 %DeKalb County: 9.1 %De Witt County: 11.8 %Douglas County: 11.3 %DuPage County: 9.4 %Edgar County: 12.4 %Edwards County: 12.5 %Effingham County: 10.7 %Fayette County: 12.4 %Ford County: 11.5 %Franklin County: 13.2 %Fulton County: 12.3 %Gallatin County: 13.6 %Greene County: 12.2 %Grundy County: 9.5 %Hamilton County: 12.5 %Hancock County: 12.2 %Hardin County: 13.7 %Henderson County: 12.3 %Henry County: 11.2 %Iroquois County: 12.6 %Jackson County: 11.2 %Jasper County: 11.5 %Jefferson County: 12.1 %Jersey County: 10.3 %Jo Daviess County: 12.6 %Johnson County: 12.1 %Kane County: 10.8 %Kankakee County: 11.8 %Kendall County: 8.5 %Knox County: 13 %Lake County: 10.3 %LaSalle County: 11.8 %Lawrence County: 11.8 %Lee County: 11.8 %Livingston County: 11.7 %Logan County: 10.3 %McDonough County: 10.5 %McHenry County: 9.5 %McLean County: 9.1 %Macon County: 12.6 %Macoupin County: 12.3 %Madison County: 10.8 %Marion County: 12.9 %Marshall County: 12.1 %Mason County: 12.5 %Massac County: 13.1 %Menard County: 10.5 %Mercer County: 11.9 %Monroe County: 9.3 %Montgomery County: 12.1 %Morgan County: 12 %Moultrie County: 10.9 %Ogle County: 11.4 %Peoria County: 11.7 %Perry County: 12.5 %Piatt County: 10 %Pike County: 12.5 %Pope County: 14.8 %Pulaski County: 16.5 %Putnam County: 11.8 %Randolph County: 12.3 %Richland County: 11.9 %Rock Island County: 12.6 %St. Clair County: 13 %Saline County: 12.8 %Sangamon County: 11 %Schuyler County: 12.8 %Scott County: 11.5 %Shelby County: 11.8 %Stark County: 12.1 %Stephenson County: 13.1 %Tazewell County: 10.3 %Union County: 12.9 %Vermilion County: 13.6 %Wabash County: 12.5 %Warren County: 11.5 %Washington County: 10.8 %Wayne County: 12.8 %White County: 13.1 %Whiteside County: 12.2 %Will County: 10.1 %Williamson County: 11.5 %Winnebago County: 12.9 %Woodford County: 9.6 %
  • Under 11
  • 11 to 12
  • 12 to 13
  • 13 and over
%, 2021. Source: CDC, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Alexander County: 18.4 %Alexander County18.4Pulaski County: 16.5 %Pulaski County16.5Pope County: 14.8 %Pope County14.8Hardin County: 13.7 %Hardin County13.7Gallatin County: 13.6 %Gallatin County13.6Vermilion County: 13.6 %Vermilion County13.6Franklin County: 13.2 %Franklin County13.2Massac County: 13.1 %Massac County13.1Stephenson County: 13.1 %Stephenson County13.1White County: 13.1 %White County13.1Knox County: 13 %Knox County13St. Clair County: 13 %St. Clair County13Marion County: 12.9 %Marion County12.9Union County: 12.9 %Union County12.9Winnebago County: 12.9 %Winnebago County12.9Carroll County: 12.8 %Carroll County12.8Saline County: 12.8 %Saline County12.8Schuyler County: 12.8 %Schuyler County12.8Wayne County: 12.8 %Wayne County12.8Cass County: 12.7 %Cass County12.7Bureau County: 12.6 %Bureau County12.6Clay County: 12.6 %Clay County12.6Iroquois County: 12.6 %Iroquois County12.6Jo Daviess County: 12.6 %Jo Daviess County12.6Macon County: 12.6 %Macon County12.6Rock Island County: 12.6 %Rock Island County12.6Edwards County: 12.5 %Edwards County12.5Hamilton County: 12.5 %Hamilton County12.5Mason County: 12.5 %Mason County12.5Perry County: 12.5 %Perry County12.5Pike County: 12.5 %Pike County12.5Wabash County: 12.5 %Wabash County12.5Edgar County: 12.4 %Edgar County12.4Fayette County: 12.4 %Fayette County12.4Fulton County: 12.3 %Fulton County12.3Henderson County: 12.3 %Henderson County12.3Macoupin County: 12.3 %Macoupin County12.3Randolph County: 12.3 %Randolph County12.3Greene County: 12.2 %Greene County12.2Hancock County: 12.2 %Hancock County12.2Alexander County: 18.4 %Alexander County18.4Pulaski County: 16.5 %Pulaski County16.5Pope County: 14.8 %Pope County14.8Hardin County: 13.7 %Hardin County13.7Gallatin County: 13.6 %Gallatin County13.6Vermilion County: 13.6 %Vermilion County13.6Franklin County: 13.2 %Franklin County13.2Massac County: 13.1 %Massac County13.1Stephenson County: 13.1 %Stephenson County13.1White County: 13.1 %White County13.1Knox County: 13 %Knox County13St. Clair County: 13 %St. Clair County13Marion County: 12.9 %Marion County12.9Union County: 12.9 %Union County12.9Winnebago County: 12.9 %Winnebago County12.9Carroll County: 12.8 %Carroll County12.8Saline County: 12.8 %Saline County12.8Schuyler County: 12.8 %Schuyler County12.8Wayne County: 12.8 %Wayne County12.8Cass County: 12.7 %Cass County12.7Bureau County: 12.6 %Bureau County12.6Clay County: 12.6 %Clay County12.6Iroquois County: 12.6 %Iroquois County12.6Jo Daviess County: 12.6 %Jo Daviess County12.6Macon County: 12.6 %Macon County12.6Rock Island County: 12.6 %Rock Island County12.6Edwards County: 12.5 %Edwards County12.5Hamilton County: 12.5 %Hamilton County12.5Mason County: 12.5 %Mason County12.5Perry County: 12.5 %Perry County12.5Pike County: 12.5 %Pike County12.5Wabash County: 12.5 %Wabash County12.5Edgar County: 12.4 %Edgar County12.4Fayette County: 12.4 %Fayette County12.4Fulton County: 12.3 %Fulton County12.3Henderson County: 12.3 %Henderson County12.3Macoupin County: 12.3 %Macoupin County12.3Randolph County: 12.3 %Randolph County12.3Greene County: 12.2 %Greene County12.2Hancock County: 12.2 %Hancock County12.2
%. Source: CDC, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Alexander County18.4
2Pulaski County16.5
3Pope County14.8
4Hardin County13.7
5Gallatin County13.6
5Vermilion County13.6
7Franklin County13.2
8Massac County13.1
8Stephenson County13.1
8White County13.1
11Knox County13
11St. Clair County13
13Marion County12.9
13Union County12.9
13Winnebago County12.9
16Carroll County12.8
16Saline County12.8
16Schuyler County12.8
16Wayne County12.8
20Cass County12.7
21Bureau County12.6
21Clay County12.6
21Iroquois County12.6
21Jo Daviess County12.6
21Macon County12.6
21Rock Island County12.6
27Edwards County12.5
27Hamilton County12.5
27Mason County12.5
27Perry County12.5
27Pike County12.5
27Wabash County12.5
33Edgar County12.4
33Fayette County12.4
35Fulton County12.3
35Henderson County12.3
35Macoupin County12.3
35Randolph County12.3
39Greene County12.2
39Hancock County12.2
39Whiteside County12.2
42Bond County12.1
42Jefferson County12.1
42Johnson County12.1
42Marshall County12.1
42Montgomery County12.1
42Stark County12.1
48Morgan County12
49Mercer County11.9
49Richland County11.9
51Christian County11.8
51De Witt County11.8
51Kankakee County11.8
51LaSalle County11.8
51Lawrence County11.8
51Lee County11.8
51Putnam County11.8
51Shelby County11.8
59Livingston County11.7
59Peoria County11.7
61Calhoun County11.5
61Ford County11.5
61Jasper County11.5
61Scott County11.5
61Warren County11.5
61Williamson County11.5
67Adams County11.4
67Crawford County11.4
67Ogle County11.4
70Douglas County11.3
71Cook County11.2
71Cumberland County11.2
71Henry County11.2
71Jackson County11.2
75Boone County11
75Sangamon County11
77Moultrie County10.9
78Clark County10.8
78Kane County10.8
78Madison County10.8
78Washington County10.8
82Brown County10.7
82Effingham County10.7
84Coles County10.6
85McDonough County10.5
85Menard County10.5
87Clinton County10.3
87Jersey County10.3
87Lake County10.3
87Logan County10.3
87Tazewell County10.3
92Will County10.1
93Piatt County10
94Woodford County9.6
95Grundy County9.5
95McHenry County9.5
97DuPage County9.4
98Monroe County9.3
99DeKalb County9.1
99McLean County9.1
101Champaign County9
102Kendall County8.5

Other periods

About this ranking

Percentage of adults who report being told by a doctor or other health professional that they have diabetes, other than diabetes only during pregnancy. Model-based estimate for adults aged 18 and over from CDC PLACES. Crude prevalence, not age-adjusted.

US counties and cities (incorporated places of 10,000 or more). CDC PLACES combines Behavioral Risk Factor Surveillance System (BRFSS) answers with local population data through multilevel regression and poststratification, so a county or city value is a model estimate, not a survey count. The year is the BRFSS survey year, not the release year. CDC says the method does not support tracking change in a place over time, and each annual release can change the model, so values for different years are not strictly comparable. A state is missing in a year when its BRFSS data did not meet standards (Kentucky and Pennsylvania in 2023, Florida in 2021). Connecticut counties appear as its nine planning regions from 2022; its eight former counties are not served. City values for 2021 come from the 2023 release, built on 2010 Census place boundaries; later years use 2020 boundaries.

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

Centers for Disease Control and Prevention (CDC). PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence. https://www.cdc.gov/places/. Retrieved 2026-10-12. These data are available free from CDC. Use does not imply endorsement by CDC, ATSDR, HHS or the United States Government.

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

Centers for Disease Control and Prevention. (2025). PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence (Counties in Illinois by diagnosed diabetes in adults, local model estimate, 2021) [Data set]. Retrieved October 12, 2026, from https://www.cdc.gov/places/

MLA 9

PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence, Counties in Illinois by diagnosed diabetes in adults, local model estimate, 2021. Centers for Disease Control and Prevention, 4 Dec. 2025, https://www.cdc.gov/places/. Invokely, https://invokely.ai/rankings/adult-diabetes-rate-county-estimate/illinois-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

Centers for Disease Control and Prevention. 2025. PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence. Counties in Illinois by diagnosed diabetes in adults, local model estimate, 2021. Dataset. Accessed October 12, 2026. https://www.cdc.gov/places/. Also distributed by Invokely, https://invokely.ai/rankings/adult-diabetes-rate-county-estimate/illinois-counties?period=2021.

Harvard

Centers for Disease Control and Prevention (2025) PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence, Counties in Illinois by diagnosed diabetes in adults, local model estimate, 2021 [Dataset]. Available at: https://www.cdc.gov/places/, via Invokely: https://invokely.ai/rankings/adult-diabetes-rate-county-estimate/illinois-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{centers_counties_in_illinois_by_2021,
  author = {{Centers for Disease Control and Prevention}},
  title = {{PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence: Counties in Illinois by diagnosed diabetes in adults, local model estimate, 2021}},
  year = {2025},
  howpublished = {Data set},
  url = {https://www.cdc.gov/places/},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/adult-diabetes-rate-county-estimate/illinois-counties?period=2021. Publisher attribution: Centers for Disease Control and Prevention (CDC). PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence. https://www.cdc.gov/places/. Retrieved 2026-10-12. These data are available free from CDC. Use does not imply endorsement by CDC, ATSDR, HHS or the United States Government.},
}
RIS
TY  - DATA
AU  - Centers for Disease Control and Prevention
TI  - PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence: Counties in Illinois by diagnosed diabetes in adults, local model estimate, 2021
PY  - 2025
DA  - 2025/12/04
PB  - Centers for Disease Control and Prevention
DB  - Invokely
UR  - https://www.cdc.gov/places/
L2  - https://invokely.ai/rankings/adult-diabetes-rate-county-estimate/illinois-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-diabetes-rate-county-estimate/illinois-counties?period=2021.
N1  - Publisher attribution: Centers for Disease Control and Prevention (CDC). PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence. https://www.cdc.gov/places/. Retrieved 2026-10-12. These data are available free from CDC. Use does not imply endorsement by CDC, ATSDR, HHS or the United States Government.
ER  -
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Rank Counties in Illinois by diagnosed diabetes in adults, local model estimate using official data, and cite the source.
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Questions

Which county has the highest diagnosed diabetes in adults, local model estimate?

Alexander County, with 18.4% in 2021, according to the Centers for Disease Control and Prevention.

Which county has the lowest diagnosed diabetes in adults, local model estimate?

Kendall County, with 8.5% in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: Centers for Disease Control and Prevention, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), diagnosed diabetes in adults, crude prevalence. Retrieved 2026-10-12.

Diagnosed diabetes in adults, local model estimate: other rankings

Counties in Illinois: more rankings