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

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

Woodbury County had the highest current asthma in adults, local model estimate of 99 counties in 2021, at 10.3%. Sioux County had the lowest, at 8.7%. The median was 9.3%. Source: the Centers for Disease Control and Prevention.

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Highest10.3Woodbury County
Lowest8.7Sioux County
Median9.399 counties

Map of counties, 2021

Adair County: 9.3 %Adams County: 9.2 %Allamakee County: 9.2 %Appanoose County: 9.9 %Audubon County: 9.2 %Benton County: 9.2 %Black Hawk County: 9.8 %Boone County: 9.2 %Bremer County: 9 %Buchanan County: 9.1 %Buena Vista County: 9.3 %Butler County: 9.3 %Calhoun County: 9.1 %Carroll County: 9.2 %Cass County: 9.5 %Cedar County: 9.1 %Cerro Gordo County: 9.2 %Cherokee County: 9.2 %Chickasaw County: 9.2 %Clarke County: 9.7 %Clay County: 9.2 %Clayton County: 9.3 %Clinton County: 9.7 %Crawford County: 9.3 %Dallas County: 8.9 %Davis County: 9.9 %Decatur County: 9.8 %Delaware County: 9.1 %Des Moines County: 9.7 %Dickinson County: 9 %Dubuque County: 9.2 %Emmet County: 9.5 %Fayette County: 9.5 %Floyd County: 9.3 %Franklin County: 9.4 %Fremont County: 9.3 %Greene County: 9.4 %Grundy County: 9 %Guthrie County: 9.1 %Hamilton County: 9.1 %Hancock County: 9.2 %Hardin County: 9.4 %Harrison County: 9.3 %Henry County: 9.3 %Howard County: 9.2 %Humboldt County: 9.4 %Ida County: 9.2 %Iowa County: 9.1 %Jackson County: 9.3 %Jasper County: 9 %Jefferson County: 8.9 %Johnson County: 9.7 %Jones County: 9.2 %Keokuk County: 9.5 %Kossuth County: 9.1 %Lee County: 9.5 %Linn County: 9.4 %Louisa County: 9.3 %Lucas County: 9.5 %Lyon County: 9.1 %Madison County: 9.1 %Mahaska County: 9.4 %Marion County: 9 %Marshall County: 9.4 %Mills County: 9.1 %Mitchell County: 9.2 %Monona County: 9.5 %Monroe County: 9.3 %Montgomery County: 9.7 %Muscatine County: 9.1 %O'Brien County: 9.3 %Osceola County: 9.1 %Page County: 9.4 %Palo Alto County: 9.2 %Plymouth County: 9 %Pocahontas County: 9.4 %Polk County: 9.1 %Pottawattamie County: 9.6 %Poweshiek County: 9.3 %Ringgold County: 9.4 %Sac County: 9.3 %Scott County: 9.4 %Shelby County: 9.1 %Sioux County: 8.7 %Story County: 9.4 %Tama County: 9.7 %Taylor County: 9.2 %Union County: 9.4 %Van Buren County: 9.8 %Wapello County: 9.8 %Warren County: 9.1 %Washington County: 9.2 %Wayne County: 9.6 %Webster County: 9.5 %Winnebago County: 9.1 %Winneshiek County: 9 %Woodbury County: 10.3 %Worth County: 9.2 %Wright County: 9.2 %
  • Under 9.1
  • 9.1 to 9.2
  • 9.2 to 9.3
  • 9.3 to 9.4
  • 9.4 to 9.5
  • 9.5 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

Woodbury County: 10.3 %Woodbury County10.3Appanoose County: 9.9 %Appanoose County9.9Davis County: 9.9 %Davis County9.9Black Hawk County: 9.8 %Black Hawk County9.8Decatur County: 9.8 %Decatur County9.8Van Buren County: 9.8 %Van Buren County9.8Wapello County: 9.8 %Wapello County9.8Clarke County: 9.7 %Clarke County9.7Clinton County: 9.7 %Clinton County9.7Des Moines County: 9.7 %Des Moines County9.7Johnson County: 9.7 %Johnson County9.7Montgomery County: 9.7 %Montgomery County9.7Tama County: 9.7 %Tama County9.7Pottawattamie County: 9.6 %Pottawattamie County9.6Wayne County: 9.6 %Wayne County9.6Cass County: 9.5 %Cass County9.5Emmet County: 9.5 %Emmet County9.5Fayette County: 9.5 %Fayette County9.5Keokuk County: 9.5 %Keokuk County9.5Lee County: 9.5 %Lee County9.5Lucas County: 9.5 %Lucas County9.5Monona County: 9.5 %Monona County9.5Webster County: 9.5 %Webster County9.5Franklin County: 9.4 %Franklin County9.4Greene County: 9.4 %Greene County9.4Hardin County: 9.4 %Hardin County9.4Humboldt County: 9.4 %Humboldt County9.4Linn County: 9.4 %Linn County9.4Mahaska County: 9.4 %Mahaska County9.4Marshall County: 9.4 %Marshall County9.4Page County: 9.4 %Page County9.4Pocahontas County: 9.4 %Pocahontas County9.4Ringgold County: 9.4 %Ringgold County9.4Scott County: 9.4 %Scott County9.4Story County: 9.4 %Story County9.4Union County: 9.4 %Union County9.4Adair County: 9.3 %Adair County9.3Buena Vista County: 9.3 %Buena Vista County9.3Butler County: 9.3 %Butler County9.3Clayton County: 9.3 %Clayton County9.3Woodbury County: 10.3 %Woodbury County10.3Appanoose County: 9.9 %Appanoose County9.9Davis County: 9.9 %Davis County9.9Black Hawk County: 9.8 %Black Hawk County9.8Decatur County: 9.8 %Decatur County9.8Van Buren County: 9.8 %Van Buren County9.8Wapello County: 9.8 %Wapello County9.8Clarke County: 9.7 %Clarke County9.7Clinton County: 9.7 %Clinton County9.7Des Moines County: 9.7 %Des Moines County9.7Johnson County: 9.7 %Johnson County9.7Montgomery County: 9.7 %Montgomery County9.7Tama County: 9.7 %Tama County9.7Pottawattamie County: 9.6 %Pottawattamie County9.6Wayne County: 9.6 %Wayne County9.6Cass County: 9.5 %Cass County9.5Emmet County: 9.5 %Emmet County9.5Fayette County: 9.5 %Fayette County9.5Keokuk County: 9.5 %Keokuk County9.5Lee County: 9.5 %Lee County9.5Lucas County: 9.5 %Lucas County9.5Monona County: 9.5 %Monona County9.5Webster County: 9.5 %Webster County9.5Franklin County: 9.4 %Franklin County9.4Greene County: 9.4 %Greene County9.4Hardin County: 9.4 %Hardin County9.4Humboldt County: 9.4 %Humboldt County9.4Linn County: 9.4 %Linn County9.4Mahaska County: 9.4 %Mahaska County9.4Marshall County: 9.4 %Marshall County9.4Page County: 9.4 %Page County9.4Pocahontas County: 9.4 %Pocahontas County9.4Ringgold County: 9.4 %Ringgold County9.4Scott County: 9.4 %Scott County9.4Story County: 9.4 %Story County9.4Union County: 9.4 %Union County9.4Adair County: 9.3 %Adair County9.3Buena Vista County: 9.3 %Buena Vista County9.3Butler County: 9.3 %Butler County9.3Clayton County: 9.3 %Clayton County9.3
%. 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 (%)
1Woodbury County10.3
2Appanoose County9.9
2Davis County9.9
4Black Hawk County9.8
4Decatur County9.8
4Van Buren County9.8
4Wapello County9.8
8Clarke County9.7
8Clinton County9.7
8Des Moines County9.7
8Johnson County9.7
8Montgomery County9.7
8Tama County9.7
14Pottawattamie County9.6
14Wayne County9.6
16Cass County9.5
16Emmet County9.5
16Fayette County9.5
16Keokuk County9.5
16Lee County9.5
16Lucas County9.5
16Monona County9.5
16Webster County9.5
24Franklin County9.4
24Greene County9.4
24Hardin County9.4
24Humboldt County9.4
24Linn County9.4
24Mahaska County9.4
24Marshall County9.4
24Page County9.4
24Pocahontas County9.4
24Ringgold County9.4
24Scott County9.4
24Story County9.4
24Union County9.4
37Adair County9.3
37Buena Vista County9.3
37Butler County9.3
37Clayton County9.3
37Crawford County9.3
37Floyd County9.3
37Fremont County9.3
37Harrison County9.3
37Henry County9.3
37Jackson County9.3
37Louisa County9.3
37Monroe County9.3
37O'Brien County9.3
37Poweshiek County9.3
37Sac County9.3
52Adams County9.2
52Allamakee County9.2
52Audubon County9.2
52Benton County9.2
52Boone County9.2
52Carroll County9.2
52Cerro Gordo County9.2
52Cherokee County9.2
52Chickasaw County9.2
52Clay County9.2
52Dubuque County9.2
52Hancock County9.2
52Howard County9.2
52Ida County9.2
52Jones County9.2
52Mitchell County9.2
52Palo Alto County9.2
52Taylor County9.2
52Washington County9.2
52Worth County9.2
52Wright County9.2
73Buchanan County9.1
73Calhoun County9.1
73Cedar County9.1
73Delaware County9.1
73Guthrie County9.1
73Hamilton County9.1
73Iowa County9.1
73Kossuth County9.1
73Lyon County9.1
73Madison County9.1
73Mills County9.1
73Muscatine County9.1
73Osceola County9.1
73Polk County9.1
73Shelby County9.1
73Warren County9.1
73Winnebago County9.1
90Bremer County9
90Dickinson County9
90Grundy County9
90Jasper County9
90Marion County9
90Plymouth County9
90Winneshiek County9
97Dallas County8.9
97Jefferson County8.9
99Sioux 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 Iowa 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 Iowa 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/iowa-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 Iowa 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/iowa-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 Iowa 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/iowa-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{centers_counties_in_iowa_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 Iowa 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/iowa-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 Iowa 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/iowa-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-asthma-rate-county-estimate/iowa-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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Questions

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

Woodbury County, with 10.3% in 2021, according to the Centers for Disease Control and Prevention.

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

Sioux 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 Iowa: more rankings