Data / Rankings / Adult obesity rate, local model estimate / Counties in Illinois

Counties in Illinois by adult obesity rate, local model estimate

St. Clair County had the highest adult obesity rate, local model estimate of 102 counties in 2021, at 43.9%. Champaign County had the lowest, at 29.6%. The median was 36.6%. Source: the Centers for Disease Control and Prevention.

Highest43.9St. Clair County
Lowest29.6Champaign County
Median36.6102 counties

Top 40 counties, 2021

St. Clair County: 43.9 %St. Clair County43.9Alexander County: 43.8 %Alexander County43.8Winnebago County: 41.9 %Winnebago County41.9Pulaski County: 41.7 %Pulaski County41.7Knox County: 41.2 %Knox County41.2Marion County: 39.7 %Marion County39.7Brown County: 39.5 %Brown County39.5Franklin County: 39.5 %Franklin County39.5Perry County: 39.2 %Perry County39.2Fayette County: 39.1 %Fayette County39.1Mason County: 39 %Mason County39Randolph County: 38.9 %Randolph County38.9White County: 38.9 %White County38.9Johnson County: 38.8 %Johnson County38.8Livingston County: 38.7 %Livingston County38.7Bond County: 38.6 %Bond County38.6Christian County: 38.5 %Christian County38.5Saline County: 38.4 %Saline County38.4Macon County: 38.2 %Macon County38.2Schuyler County: 38.2 %Schuyler County38.2Gallatin County: 38.1 %Gallatin County38.1Madison County: 38.1 %Madison County38.1Stephenson County: 38 %Stephenson County38Pike County: 37.8 %Pike County37.8Rock Island County: 37.8 %Rock Island County37.8Whiteside County: 37.8 %Whiteside County37.8Carroll County: 37.7 %Carroll County37.7Iroquois County: 37.7 %Iroquois County37.7Lawrence County: 37.7 %Lawrence County37.7Vermilion County: 37.7 %Vermilion County37.7Cass County: 37.6 %Cass County37.6Edwards County: 37.6 %Edwards County37.6Hardin County: 37.6 %Hardin County37.6Kankakee County: 37.6 %Kankakee County37.6Massac County: 37.6 %Massac County37.6Morgan County: 37.6 %Morgan County37.6De Witt County: 37.5 %De Witt County37.5Greene County: 37.5 %Greene County37.5Bureau County: 37.4 %Bureau County37.4Fulton County: 37.3 %Fulton County37.3
%. Source: CDC, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), adult obesity rate, crude prevalence. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1St. Clair County43.9
2Alexander County43.8
3Winnebago County41.9
4Pulaski County41.7
5Knox County41.2
6Marion County39.7
7Brown County39.5
7Franklin County39.5
9Perry County39.2
10Fayette County39.1
11Mason County39
12Randolph County38.9
12White County38.9
14Johnson County38.8
15Livingston County38.7
16Bond County38.6
17Christian County38.5
18Saline County38.4
19Macon County38.2
19Schuyler County38.2
21Gallatin County38.1
21Madison County38.1
23Stephenson County38
24Pike County37.8
24Rock Island County37.8
24Whiteside County37.8
27Carroll County37.7
27Iroquois County37.7
27Lawrence County37.7
27Vermilion County37.7
31Cass County37.6
31Edwards County37.6
31Hardin County37.6
31Kankakee County37.6
31Massac County37.6
31Morgan County37.6
37De Witt County37.5
37Greene County37.5
39Bureau County37.4
40Fulton County37.3
40Pope County37.3
42Hamilton County37.2
42Montgomery County37.2
44Lee County37.1
45Hancock County37
46Richland County36.9
47Ford County36.8
47Wayne County36.8
49Union County36.7
50Clay County36.6
50Mercer County36.6
50Wabash County36.6
53Edgar County36.5
54Crawford County36.4
55Jasper County36.3
56Douglas County36.1
56Scott County36.1
56Shelby County36.1
56Warren County36.1
60Jo Daviess County36
60Marshall County36
62Adams County35.9
62Cumberland County35.9
62LaSalle County35.9
62Peoria County35.9
66Logan County35.8
66McDonough County35.8
66Menard County35.8
66Tazewell County35.8
70Effingham County35.7
70Kane County35.7
70Putnam County35.7
70Stark County35.7
74Washington County35.6
75DeKalb County35.5
76Henderson County35.3
76Jefferson County35.3
76Williamson County35.3
79Grundy County35.2
80Clinton County35
80Henry County35
82Moultrie County34.9
82Ogle County34.9
84Clark County34.8
84Sangamon County34.8
86Calhoun County34.7
87Piatt County34.5
88Boone County34.2
88Will County34.2
90Macoupin County34.1
90McLean County34.1
92Coles County33.8
92Woodford County33.8
94Jackson County33.6
95Jersey County33.2
96Kendall County33.1
97Monroe County32.1
98Cook County31.5
99Lake County31.2
100McHenry County30.7
101DuPage County30.5
102Champaign County29.6

Other periods

About this ranking

Percentage of adults with a body mass index of 30 or more, calculated from self-reported weight and height. 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. State and national values come from direct BRFSS estimates under adult_obesity_rate.

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), adult obesity rate, 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), adult obesity rate, crude prevalence (Counties in Illinois by adult obesity rate, 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), adult obesity rate, crude prevalence, Counties in Illinois by adult obesity rate, local model estimate, 2021. Centers for Disease Control and Prevention, 4 Dec. 2025, https://www.cdc.gov/places/. Invokely, https://invokely.ai/rankings/adult-obesity-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), adult obesity rate, crude prevalence. Counties in Illinois by adult obesity rate, local model estimate, 2021. Dataset. Accessed October 12, 2026. https://www.cdc.gov/places/. Also distributed by Invokely, https://invokely.ai/rankings/adult-obesity-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), adult obesity rate, crude prevalence, Counties in Illinois by adult obesity rate, local model estimate, 2021 [Dataset]. Available at: https://www.cdc.gov/places/, via Invokely: https://invokely.ai/rankings/adult-obesity-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), adult obesity rate, crude prevalence: Counties in Illinois by adult obesity rate, 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-obesity-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), adult obesity rate, 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), adult obesity rate, crude prevalence: Counties in Illinois by adult obesity rate, 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-obesity-rate-county-estimate/illinois-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-obesity-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), adult obesity rate, 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 adult obesity rate, local model estimate using official data, and cite the source.
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Questions

Which county has the highest adult obesity rate, local model estimate?

St. Clair County, with 43.9% in 2021, according to the Centers for Disease Control and Prevention.

Which county has the lowest adult obesity rate, local model estimate?

Champaign County, with 29.6% 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), adult obesity rate, crude prevalence. Retrieved 2026-10-12.

Adult obesity rate, local model estimate: other rankings

Counties in Illinois: more rankings