Data / Rankings / Current asthma in adults, local model estimate / Counties in Illinois

Counties in Illinois by current asthma in adults, local model estimate

Alexander County had the highest current asthma in adults, local model estimate of 102 counties in 2021, at 11.3%. DuPage County had the lowest, at 8.7%. The median was 10%. Source: the Centers for Disease Control and Prevention.

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Highest11.3Alexander County
Lowest8.7DuPage County
Median10102 counties

Map of counties, 2021

Adams County: 10 %Alexander County: 11.3 %Bond County: 10.1 %Boone County: 9.6 %Brown County: 9.6 %Bureau County: 9.8 %Calhoun County: 9.5 %Carroll County: 9.8 %Cass County: 10 %Champaign County: 10.1 %Christian County: 9.9 %Clark County: 9.7 %Clay County: 10.2 %Clinton County: 9.7 %Coles County: 10.5 %Cook County: 9.2 %Crawford County: 9.9 %Cumberland County: 9.7 %DeKalb County: 10.1 %De Witt County: 9.9 %Douglas County: 10.1 %DuPage County: 8.7 %Edgar County: 10 %Edwards County: 10.1 %Effingham County: 9.8 %Fayette County: 10.2 %Ford County: 10 %Franklin County: 10.5 %Fulton County: 10 %Gallatin County: 10.3 %Greene County: 10 %Grundy County: 9.6 %Hamilton County: 10.1 %Hancock County: 9.7 %Hardin County: 10.1 %Henderson County: 9.5 %Henry County: 9.6 %Iroquois County: 10 %Jackson County: 11 %Jasper County: 9.8 %Jefferson County: 10.1 %Jersey County: 9.7 %Jo Daviess County: 9.5 %Johnson County: 9.9 %Kane County: 9.4 %Kankakee County: 10.3 %Kendall County: 9.2 %Knox County: 10.3 %Lake County: 9 %LaSalle County: 9.8 %Lawrence County: 10.1 %Lee County: 9.6 %Livingston County: 10.1 %Logan County: 10 %McDonough County: 10.6 %McHenry County: 9.2 %McLean County: 10 %Macon County: 10.4 %Macoupin County: 10.1 %Madison County: 10 %Marion County: 10.4 %Marshall County: 9.8 %Mason County: 10 %Massac County: 10.5 %Menard County: 9.6 %Mercer County: 9.8 %Monroe County: 9.2 %Montgomery County: 9.9 %Morgan County: 10.2 %Moultrie County: 10.1 %Ogle County: 9.7 %Peoria County: 10.2 %Perry County: 10.2 %Piatt County: 9.4 %Pike County: 10.1 %Pope County: 10.1 %Pulaski County: 10.9 %Putnam County: 9.4 %Randolph County: 10 %Richland County: 10 %Rock Island County: 10.1 %St. Clair County: 10.3 %Saline County: 10.5 %Sangamon County: 10.1 %Schuyler County: 9.7 %Scott County: 9.8 %Shelby County: 9.7 %Stark County: 9.8 %Stephenson County: 10.1 %Tazewell County: 9.7 %Union County: 10.1 %Vermilion County: 10.4 %Wabash County: 10 %Warren County: 10 %Washington County: 9.5 %Wayne County: 10.3 %White County: 10.3 %Whiteside County: 9.8 %Will County: 9.3 %Williamson County: 10 %Winnebago County: 10.3 %Woodford County: 9.4 %
  • Under 9.6
  • 9.6 to 9.8
  • 9.8 to 10
  • 10 and over
%, 2021. Source: CDC, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), current asthma in adults, crude prevalence. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Alexander County: 11.3 %Alexander County11.3Jackson County: 11 %Jackson County11Pulaski County: 10.9 %Pulaski County10.9McDonough County: 10.6 %McDonough County10.6Coles County: 10.5 %Coles County10.5Franklin County: 10.5 %Franklin County10.5Massac County: 10.5 %Massac County10.5Saline County: 10.5 %Saline County10.5Macon County: 10.4 %Macon County10.4Marion County: 10.4 %Marion County10.4Vermilion County: 10.4 %Vermilion County10.4Gallatin County: 10.3 %Gallatin County10.3Kankakee County: 10.3 %Kankakee County10.3Knox County: 10.3 %Knox County10.3St. Clair County: 10.3 %St. Clair County10.3Wayne County: 10.3 %Wayne County10.3White County: 10.3 %White County10.3Winnebago County: 10.3 %Winnebago County10.3Clay County: 10.2 %Clay County10.2Fayette County: 10.2 %Fayette County10.2Morgan County: 10.2 %Morgan County10.2Peoria County: 10.2 %Peoria County10.2Perry County: 10.2 %Perry County10.2Bond County: 10.1 %Bond County10.1Champaign County: 10.1 %Champaign County10.1DeKalb County: 10.1 %DeKalb County10.1Douglas County: 10.1 %Douglas County10.1Edwards County: 10.1 %Edwards County10.1Hamilton County: 10.1 %Hamilton County10.1Hardin County: 10.1 %Hardin County10.1Jefferson County: 10.1 %Jefferson County10.1Lawrence County: 10.1 %Lawrence County10.1Livingston County: 10.1 %Livingston County10.1Macoupin County: 10.1 %Macoupin County10.1Moultrie County: 10.1 %Moultrie County10.1Pike County: 10.1 %Pike County10.1Pope County: 10.1 %Pope County10.1Rock Island County: 10.1 %Rock Island County10.1Sangamon County: 10.1 %Sangamon County10.1Stephenson County: 10.1 %Stephenson County10.1Alexander County: 11.3 %Alexander County11.3Jackson County: 11 %Jackson County11Pulaski County: 10.9 %Pulaski County10.9McDonough County: 10.6 %McDonough County10.6Coles County: 10.5 %Coles County10.5Franklin County: 10.5 %Franklin County10.5Massac County: 10.5 %Massac County10.5Saline County: 10.5 %Saline County10.5Macon County: 10.4 %Macon County10.4Marion County: 10.4 %Marion County10.4Vermilion County: 10.4 %Vermilion County10.4Gallatin County: 10.3 %Gallatin County10.3Kankakee County: 10.3 %Kankakee County10.3Knox County: 10.3 %Knox County10.3St. Clair County: 10.3 %St. Clair County10.3Wayne County: 10.3 %Wayne County10.3White County: 10.3 %White County10.3Winnebago County: 10.3 %Winnebago County10.3Clay County: 10.2 %Clay County10.2Fayette County: 10.2 %Fayette County10.2Morgan County: 10.2 %Morgan County10.2Peoria County: 10.2 %Peoria County10.2Perry County: 10.2 %Perry County10.2Bond County: 10.1 %Bond County10.1Champaign County: 10.1 %Champaign County10.1DeKalb County: 10.1 %DeKalb County10.1Douglas County: 10.1 %Douglas County10.1Edwards County: 10.1 %Edwards County10.1Hamilton County: 10.1 %Hamilton County10.1Hardin County: 10.1 %Hardin County10.1Jefferson County: 10.1 %Jefferson County10.1Lawrence County: 10.1 %Lawrence County10.1Livingston County: 10.1 %Livingston County10.1Macoupin County: 10.1 %Macoupin County10.1Moultrie County: 10.1 %Moultrie County10.1Pike County: 10.1 %Pike County10.1Pope County: 10.1 %Pope County10.1Rock Island County: 10.1 %Rock Island County10.1Sangamon County: 10.1 %Sangamon County10.1Stephenson County: 10.1 %Stephenson County10.1
%. Source: CDC, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), current asthma in adults, crude prevalence. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Alexander County11.3
2Jackson County11
3Pulaski County10.9
4McDonough County10.6
5Coles County10.5
5Franklin County10.5
5Massac County10.5
5Saline County10.5
9Macon County10.4
9Marion County10.4
9Vermilion County10.4
12Gallatin County10.3
12Kankakee County10.3
12Knox County10.3
12St. Clair County10.3
12Wayne County10.3
12White County10.3
12Winnebago County10.3
19Clay County10.2
19Fayette County10.2
19Morgan County10.2
19Peoria County10.2
19Perry County10.2
24Bond County10.1
24Champaign County10.1
24DeKalb County10.1
24Douglas County10.1
24Edwards County10.1
24Hamilton County10.1
24Hardin County10.1
24Jefferson County10.1
24Lawrence County10.1
24Livingston County10.1
24Macoupin County10.1
24Moultrie County10.1
24Pike County10.1
24Pope County10.1
24Rock Island County10.1
24Sangamon County10.1
24Stephenson County10.1
24Union County10.1
42Adams County10
42Cass County10
42Edgar County10
42Ford County10
42Fulton County10
42Greene County10
42Iroquois County10
42Logan County10
42Madison County10
42Mason County10
42McLean County10
42Randolph County10
42Richland County10
42Wabash County10
42Warren County10
42Williamson County10
58Christian County9.9
58Crawford County9.9
58De Witt County9.9
58Johnson County9.9
58Montgomery County9.9
63Bureau County9.8
63Carroll County9.8
63Effingham County9.8
63Jasper County9.8
63LaSalle County9.8
63Marshall County9.8
63Mercer County9.8
63Scott County9.8
63Stark County9.8
63Whiteside County9.8
73Clark County9.7
73Clinton County9.7
73Cumberland County9.7
73Hancock County9.7
73Jersey County9.7
73Ogle County9.7
73Schuyler County9.7
73Shelby County9.7
73Tazewell County9.7
82Boone County9.6
82Brown County9.6
82Grundy County9.6
82Henry County9.6
82Lee County9.6
82Menard County9.6
88Calhoun County9.5
88Henderson County9.5
88Jo Daviess County9.5
88Washington County9.5
92Kane County9.4
92Piatt County9.4
92Putnam County9.4
92Woodford County9.4
96Will County9.3
97Cook County9.2
97Kendall County9.2
97McHenry County9.2
97Monroe County9.2
101Lake County9
102DuPage County8.7

Other periods

About this ranking

Percentage of adults who have ever been told by a doctor, nurse or other health professional that they have asthma and say they still have it. 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), current asthma 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), current asthma in adults, crude prevalence (Counties in Illinois by current asthma 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), current asthma in adults, crude prevalence, Counties in Illinois by current asthma 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-asthma-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), current asthma in adults, crude prevalence. Counties in Illinois by current asthma 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-asthma-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), current asthma in adults, crude prevalence, Counties in Illinois by current asthma in adults, local model estimate, 2021 [Dataset]. Available at: https://www.cdc.gov/places/, via Invokely: https://invokely.ai/rankings/adult-asthma-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), current asthma in adults, crude prevalence: Counties in Illinois by current asthma 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-asthma-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), current asthma 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), current asthma in adults, crude prevalence: Counties in Illinois by current asthma 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-asthma-rate-county-estimate/illinois-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-asthma-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), current asthma 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 current asthma in adults, local model estimate using official data, and cite the source.
rank_places {"indicator":"adult_asthma_rate_modelled","level":"province","within":"Illinois","limit":10}
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Questions

Which county has the highest current asthma in adults, local model estimate?

Alexander County, with 11.3% in 2021, according to the Centers for Disease Control and Prevention.

Which county has the lowest current asthma in adults, local model estimate?

DuPage County, with 8.7% 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), current asthma in adults, crude prevalence. Retrieved 2026-10-12.

Current asthma in adults, local model estimate: other rankings

Counties in Illinois: more rankings