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

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

Philadelphia County had the highest current asthma in adults, local model estimate of 67 counties in 2021, at 11.8%. Chester County had the lowest, at 9.6%. The median was 10.5%. Source: the Centers for Disease Control and Prevention.

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Highest11.8Philadelphia County
Lowest9.6Chester County
Median10.567 counties

Map of counties, 2021

Adams County: 10.3 %Allegheny County: 10.5 %Armstrong County: 10.5 %Beaver County: 10.4 %Bedford County: 10.5 %Berks County: 10.5 %Blair County: 10.7 %Bradford County: 10.6 %Bucks County: 9.9 %Butler County: 9.9 %Cambria County: 10.6 %Cameron County: 10.8 %Carbon County: 10.6 %Centre County: 10.4 %Chester County: 9.6 %Clarion County: 10.9 %Clearfield County: 10.5 %Clinton County: 10.9 %Columbia County: 10.9 %Crawford County: 10.8 %Cumberland County: 10 %Dauphin County: 10.6 %Delaware County: 10.2 %Elk County: 10.4 %Erie County: 11 %Fayette County: 10.9 %Forest County: 10 %Franklin County: 10.4 %Fulton County: 10.6 %Greene County: 10.6 %Huntingdon County: 10.5 %Indiana County: 10.8 %Jefferson County: 10.7 %Juniata County: 10.7 %Lackawanna County: 10.4 %Lancaster County: 10.5 %Lawrence County: 10.7 %Lebanon County: 10.3 %Lehigh County: 10.4 %Luzerne County: 10.4 %Lycoming County: 10.9 %McKean County: 10.8 %Mercer County: 10.6 %Mifflin County: 11 %Monroe County: 10.6 %Montgomery County: 9.7 %Montour County: 10.2 %Northampton County: 10.1 %Northumberland County: 10.5 %Perry County: 10.5 %Philadelphia County: 11.8 %Pike County: 10.1 %Potter County: 10.7 %Schuylkill County: 10.7 %Snyder County: 10.7 %Somerset County: 10.4 %Sullivan County: 10.3 %Susquehanna County: 10.4 %Tioga County: 10.6 %Union County: 10.2 %Venango County: 10.5 %Warren County: 10.5 %Washington County: 10.2 %Wayne County: 10.2 %Westmoreland County: 10.2 %Wyoming County: 10.4 %York County: 10.5 %
  • Under 10
  • 10 to 11
  • 11 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

Philadelphia County: 11.8 %Philadelphia County11.8Erie County: 11 %Erie County11Mifflin County: 11 %Mifflin County11Clarion County: 10.9 %Clarion County10.9Clinton County: 10.9 %Clinton County10.9Columbia County: 10.9 %Columbia County10.9Fayette County: 10.9 %Fayette County10.9Lycoming County: 10.9 %Lycoming County10.9Cameron County: 10.8 %Cameron County10.8Crawford County: 10.8 %Crawford County10.8Indiana County: 10.8 %Indiana County10.8McKean County: 10.8 %McKean County10.8Blair County: 10.7 %Blair County10.7Jefferson County: 10.7 %Jefferson County10.7Juniata County: 10.7 %Juniata County10.7Lawrence County: 10.7 %Lawrence County10.7Potter County: 10.7 %Potter County10.7Schuylkill County: 10.7 %Schuylkill County10.7Snyder County: 10.7 %Snyder County10.7Bradford County: 10.6 %Bradford County10.6Cambria County: 10.6 %Cambria County10.6Carbon County: 10.6 %Carbon County10.6Dauphin County: 10.6 %Dauphin County10.6Fulton County: 10.6 %Fulton County10.6Greene County: 10.6 %Greene County10.6Mercer County: 10.6 %Mercer County10.6Monroe County: 10.6 %Monroe County10.6Tioga County: 10.6 %Tioga County10.6Allegheny County: 10.5 %Allegheny County10.5Armstrong County: 10.5 %Armstrong County10.5Bedford County: 10.5 %Bedford County10.5Berks County: 10.5 %Berks County10.5Clearfield County: 10.5 %Clearfield County10.5Huntingdon County: 10.5 %Huntingdon County10.5Lancaster County: 10.5 %Lancaster County10.5Northumberland County: 10.5 %Northumberland County10.5Perry County: 10.5 %Perry County10.5Venango County: 10.5 %Venango County10.5Warren County: 10.5 %Warren County10.5York County: 10.5 %York County10.5Philadelphia County: 11.8 %Philadelphia County11.8Erie County: 11 %Erie County11Mifflin County: 11 %Mifflin County11Clarion County: 10.9 %Clarion County10.9Clinton County: 10.9 %Clinton County10.9Columbia County: 10.9 %Columbia County10.9Fayette County: 10.9 %Fayette County10.9Lycoming County: 10.9 %Lycoming County10.9Cameron County: 10.8 %Cameron County10.8Crawford County: 10.8 %Crawford County10.8Indiana County: 10.8 %Indiana County10.8McKean County: 10.8 %McKean County10.8Blair County: 10.7 %Blair County10.7Jefferson County: 10.7 %Jefferson County10.7Juniata County: 10.7 %Juniata County10.7Lawrence County: 10.7 %Lawrence County10.7Potter County: 10.7 %Potter County10.7Schuylkill County: 10.7 %Schuylkill County10.7Snyder County: 10.7 %Snyder County10.7Bradford County: 10.6 %Bradford County10.6Cambria County: 10.6 %Cambria County10.6Carbon County: 10.6 %Carbon County10.6Dauphin County: 10.6 %Dauphin County10.6Fulton County: 10.6 %Fulton County10.6Greene County: 10.6 %Greene County10.6Mercer County: 10.6 %Mercer County10.6Monroe County: 10.6 %Monroe County10.6Tioga County: 10.6 %Tioga County10.6Allegheny County: 10.5 %Allegheny County10.5Armstrong County: 10.5 %Armstrong County10.5Bedford County: 10.5 %Bedford County10.5Berks County: 10.5 %Berks County10.5Clearfield County: 10.5 %Clearfield County10.5Huntingdon County: 10.5 %Huntingdon County10.5Lancaster County: 10.5 %Lancaster County10.5Northumberland County: 10.5 %Northumberland County10.5Perry County: 10.5 %Perry County10.5Venango County: 10.5 %Venango County10.5Warren County: 10.5 %Warren County10.5York County: 10.5 %York County10.5
%. 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 (%)
1Philadelphia County11.8
2Erie County11
2Mifflin County11
4Clarion County10.9
4Clinton County10.9
4Columbia County10.9
4Fayette County10.9
4Lycoming County10.9
9Cameron County10.8
9Crawford County10.8
9Indiana County10.8
9McKean County10.8
13Blair County10.7
13Jefferson County10.7
13Juniata County10.7
13Lawrence County10.7
13Potter County10.7
13Schuylkill County10.7
13Snyder County10.7
20Bradford County10.6
20Cambria County10.6
20Carbon County10.6
20Dauphin County10.6
20Fulton County10.6
20Greene County10.6
20Mercer County10.6
20Monroe County10.6
20Tioga County10.6
29Allegheny County10.5
29Armstrong County10.5
29Bedford County10.5
29Berks County10.5
29Clearfield County10.5
29Huntingdon County10.5
29Lancaster County10.5
29Northumberland County10.5
29Perry County10.5
29Venango County10.5
29Warren County10.5
29York County10.5
41Beaver County10.4
41Centre County10.4
41Elk County10.4
41Franklin County10.4
41Lackawanna County10.4
41Lehigh County10.4
41Luzerne County10.4
41Somerset County10.4
41Susquehanna County10.4
41Wyoming County10.4
51Adams County10.3
51Lebanon County10.3
51Sullivan County10.3
54Delaware County10.2
54Montour County10.2
54Union County10.2
54Washington County10.2
54Wayne County10.2
54Westmoreland County10.2
60Northampton County10.1
60Pike County10.1
62Cumberland County10
62Forest County10
64Bucks County9.9
64Butler County9.9
66Montgomery County9.7
67Chester County9.6

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 Pennsylvania 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 Pennsylvania 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/pennsylvania-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 Pennsylvania 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/pennsylvania-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 Pennsylvania 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/pennsylvania-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{centers_counties_in_pennsylvania_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 Pennsylvania 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/pennsylvania-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 Pennsylvania 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/pennsylvania-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-asthma-rate-county-estimate/pennsylvania-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 Pennsylvania 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":"Pennsylvania","limit":10}
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Questions

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

Philadelphia County, with 11.8% in 2021, according to the Centers for Disease Control and Prevention.

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

Chester County, with 9.6% 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), current asthma in adults, crude prevalence. Retrieved 2026-10-12.

Current asthma in adults, local model estimate: other rankings

Counties in Pennsylvania: more rankings