Current asthma among adults

US estimate 9.8% (95% interval 9.6–10.0), age-adjusted 9.8% (9.6–10.0). Published in the 2022, 2023, 2024, 2025 releases.

Population: All Adults
Prevalence (crude and age-adjusted) Time Period of Case Definition Calendar year

10.6%median county, 2025middle half 10.0%–11.1%

2,956counties with a 2025 estimaterange 7.8%–15.3%

Current asthma among adults: CDC's PLACES 2025 release estimates 9.8% nationally (95% confidence interval 9.6–10.0%), or 9.8% age-adjusted, from 2023 BRFSS responses.

Across the 2,956 counties with a 2025 estimate, the median county is 10.6% and the middle half of counties fall between 10.0% and 11.1%; the full range runs from 7.8% to 15.3%. Population-weighted state figures computed by this site (no interval) range from 8.9% (New Jersey) to 12.6% (Maine).

CDC advises that areas may be compared on individual measures but that the estimates should not be used to rank overall health; the county lists below are ordered by point estimate and every row carries its 95% confidence interval.

CDC's definition

A multi-level regression and post-stratification approach was applied to BRFSS and ACS data to compute a detailed probability of having current asthma (reporting ‘yes’ to both of the questions, “Have you ever been told by a doctor, nurse, or other health professional that you have asthma?” and the question, “Do you still have asthma?”). The probability was then applied to the detailed population estimates at the appropriate geographic level to generate the prevalence. The 95% confidence interval was derived using Monte Carlo simulation.

CDC's notes: Physician-diagnosed asthma is self-reported and was not confirmed by a healthcare provider or objective monitoring.

Quoted from CDC's PLACES measure definitions (cdc.gov/places/measure-definitions). BRFSS is the Behavioral Risk Factor Surveillance System, the telephone survey the model is trained on.

National distribution across counties

7.8%11.6%15.3%

Crude county point estimates in the 2025 release, 24 equal bins. Deciles: 10th 9.5%, 25th 10.0%, median 10.6%, 75th 11.1%, 90th 11.7%. Counties without a 2025 estimate (Kentucky, Pennsylvania and the states without the social-needs module) are excluded here.

By state

Crude prevalence is the estimated share of all adults. Age-adjusted prevalence is standardised to the 2000 US standard population so that areas with different age structures can be compared. CDC: "Age-adjusted estimates are only available at the county and place-level."

State	State figure, crude (site aggregate)	Lowest county	Highest county	Counties
Maine	12.6%	11.8%	13.5%	16
West Virginia	12.2%	11.6%	13.3%	55
Oregon	11.9%	11.2%	12.8%	36
Rhode Island	11.9%	10.6%	12.4%	5
Massachusetts	11.6%	10.7%	12.7%	14
Michigan	11.5%	10.5%	12.3%	83
Oklahoma	11.5%	10.1%	13.6%	77
Indiana	11.2%	10.2%	12.2%	92
Kentucky (2024 release)	11.1%	9.6%	13.1%	120*
Montana	11.1%	10.4%	14.6%	56
Ohio	11.1%	9.5%	12.0%	88
Vermont	11.1%	10.7%	11.8%	14
Connecticut	11.0%	9.8%	11.9%	9
Tennessee	11.0%	9.8%	12.4%	95
Colorado	10.9%	10.1%	11.9%	64
Delaware	10.8%	10.4%	12.5%	3
North Carolina	10.8%	10.1%	13.3%	100
Utah	10.8%	9.9%	13.3%	29
Wisconsin	10.8%	9.9%	13.9%	72
Idaho	10.7%	9.9%	12.1%	44
Washington	10.7%	9.7%	12.3%	39
Alaska	10.6%	7.8%	14.7%	30
Maryland	10.6%	9.1%	12.7%	24
Missouri	10.6%	9.8%	12.2%	115
Pennsylvania (2024 release)	10.6%	9.7%	11.6%	67*
New Hampshire	10.5%	10.0%	11.5%	10
Arizona	10.4%	9.4%	14.3%	15
Virginia	10.4%	8.9%	13.0%	133
Arkansas	10.3%	9.2%	12.2%	75
Louisiana	10.3%	9.1%	12.1%	64
New York	10.3%	8.9%	11.9%	62
District of Columbia	10.2%	10.2%	10.2%	1
Nevada	10.2%	9.8%	11.7%	17
Wyoming	10.2%	9.0%	10.9%	23
Georgia	10.1%	8.4%	12.0%	159
North Dakota	10.1%	9.4%	14.7%	53
South Dakota	10.1%	9.5%	15.3%	66
Alabama	10.0%	9.3%	12.0%	67
Mississippi	10.0%	9.1%	11.7%	82
Iowa	9.9%	9.2%	10.7%	99
Illinois	9.9%	8.9%	11.7%	102
Kansas	9.9%	9.0%	10.8%	105
Minnesota	9.9%	9.3%	12.5%	87
New Mexico	9.9%	8.4%	14.2%	33
Hawaii	9.8%	9.5%	11.0%	5
South Carolina	9.6%	8.5%	11.4%	46
Texas	9.5%	8.4%	11.5%	253
Florida	9.4%	8.5%	11.1%	67
California	9.3%	7.9%	11.0%	58
Nebraska	9.0%	8.5%	11.3%	93
New Jersey	8.9%	8.0%	10.1%	21

State	State figure, age-adjusted (site aggregate)	Counties
Maine	12.8%	16
West Virginia	12.3%	55
Oregon	11.9%	36
Rhode Island	11.9%	5
Massachusetts	11.7%	14
Oklahoma	11.6%	77
Michigan	11.5%	83
Indiana	11.3%	92
Montana	11.2%	56
Ohio	11.2%	88
Vermont	11.2%	14
Kentucky (2024 release)	11.1%	120*
Connecticut	11.0%	9
Tennessee	11.0%	95
Colorado	10.9%	64
Delaware	10.9%	3
Wisconsin	10.9%	72
North Carolina	10.8%	100
Idaho	10.7%	44
Missouri	10.7%	115
Pennsylvania (2024 release)	10.7%	67*
Utah	10.7%	29
Washington	10.7%	39
Alaska	10.6%	30
Maryland	10.6%	24
New Hampshire	10.6%	10
Arizona	10.5%	15
Virginia	10.5%	133
Arkansas	10.4%	75
Louisiana	10.4%	64
New York	10.4%	62
District of Columbia	10.2%	1
North Dakota	10.2%	53
Nevada	10.2%	17
South Dakota	10.2%	66
Wyoming	10.2%	23
Alabama	10.1%	67
Georgia	10.1%	159
Hawaii	10.1%	5
Iowa	10.0%	99
Kansas	10.0%	105
Mississippi	10.0%	82
New Mexico	10.0%	33
Illinois	9.9%	102
Minnesota	9.9%	87
South Carolina	9.7%	46
Florida	9.5%	67
Texas	9.5%	253
California	9.3%	58
Nebraska	9.0%	93
New Jersey	8.9%	21

State figures are population-weighted county estimates computed by this site (PLACES publishes no state row) and carry no interval; they are listed by point estimate, which is not a ranking of states' health. Lowest and highest county columns are crude point estimates. * This measure was not published for the state in the 2025 release; its figure, county count and county range come from the release in brackets, the most recent that has them.

Highest county estimates

County	Crude	95% interval
Todd County, SD	15.3%	13.5–17.3
Oglala Lakota County, SD	15.0%	13.3–17.0
Kusilvak Census Area, AK	14.7%	13.0–16.7
Sioux County, ND	14.7%	12.9–16.6
Glacier County, MT	14.6%	12.9–16.3
Apache County, AZ	14.3%	12.9–16.1
Roosevelt County, MT	14.2%	12.6–16.0
McKinley County, NM	14.2%	12.5–16.0
Big Horn County, MT	14.1%	12.4–15.7
Buffalo County, SD	14.0%	12.2–15.8
Menominee County, WI	13.9%	12.4–15.5
Rolette County, ND	13.8%	12.1–15.5
Ziebach County, SD	13.8%	12.2–15.5
Dewey County, SD	13.7%	12.1–15.4
Bethel Census Area, AK	13.6%	12.0–15.4
Navajo County, AZ	13.6%	12.2–15.1
Adair County, OK	13.6%	12.0–15.1
Somerset County, ME	13.5%	12.0–15.0
Aroostook County, ME	13.4%	12.0–14.9
Oxford County, ME	13.4%	11.9–15.0

County	Age-adj.	95% interval
Todd County, SD	15.1%	13.3–17.1
Oglala Lakota County, SD	14.9%	13.3–16.9
Kusilvak Census Area, AK	14.6%	12.9–16.5
Glacier County, MT	14.6%	12.9–16.3
Sioux County, ND	14.5%	12.8–16.4
Apache County, AZ	14.4%	12.9–16.2
McKinley County, NM	14.2%	12.5–16.0
Big Horn County, MT	14.1%	12.5–15.8
Roosevelt County, MT	14.1%	12.6–16.0
Menominee County, WI	14.1%	12.6–15.7
Navajo County, AZ	13.8%	12.3–15.3
Rolette County, ND	13.8%	12.2–15.5
Buffalo County, SD	13.8%	12.1–15.5
Somerset County, ME	13.7%	12.2–15.3
Ziebach County, SD	13.7%	12.1–15.5
Aroostook County, ME	13.6%	12.2–15.1
Oxford County, ME	13.6%	12.1–15.2
Adair County, OK	13.6%	12.0–15.2
Dewey County, SD	13.6%	12.0–15.4
Waldo County, ME	13.5%	12.0–15.1

Lowest county estimates

County	Crude	95% interval
Aleutians West Census Area, AK	7.8%	6.8–8.8
Aleutians East Borough, AK	7.8%	6.8–8.8
Santa Clara County, CA	7.9%	7.0–9.0
Somerset County, NJ	8.0%	7.1–8.9
Bergen County, NJ	8.0%	7.1–9.1
Morris County, NJ	8.3%	7.3–9.4
Terrell County, TX	8.4%	7.4–9.5
Mora County, NM	8.4%	7.2–9.6
Middlesex County, NJ	8.4%	7.4–9.4
Hudson County, NJ	8.4%	7.5–9.5
Forsyth County, GA	8.4%	7.4–9.6
San Francisco County, CA	8.4%	7.4–9.5
Beaufort County, SC	8.5%	7.6–9.8
Johnson County, NE	8.5%	7.5–9.6
Colfax County, NE	8.5%	7.5–9.6
Miami-Dade County, FL	8.5%	7.5–9.6
San Mateo County, CA	8.5%	7.5–9.5
Frio County, TX	8.6%	7.5–9.7
El Paso County, TX	8.6%	7.6–9.8
Guadalupe County, NM	8.6%	7.5–9.7

County	Age-adj.	95% interval
Aleutians West Census Area, AK	7.8%	6.9–8.9
Aleutians East Borough, AK	7.8%	6.8–8.9
Somerset County, NJ	7.9%	7.1–8.8
Santa Clara County, CA	7.9%	7.0–9.0
Bergen County, NJ	8.0%	7.1–9.1
Middlesex County, NJ	8.3%	7.4–9.3
Morris County, NJ	8.4%	7.3–9.4
Hudson County, NJ	8.4%	7.5–9.5
Colfax County, NE	8.4%	7.5–9.5
Forsyth County, GA	8.4%	7.3–9.6
Johnson County, NE	8.5%	7.5–9.6
San Mateo County, CA	8.5%	7.5–9.6
San Francisco County, CA	8.5%	7.5–9.6
Webb County, TX	8.6%	7.6–9.8
Reagan County, TX	8.6%	7.9–9.4
Frio County, TX	8.6%	7.5–9.7
El Paso County, TX	8.6%	7.6–9.7
Mora County, NM	8.6%	7.4–9.8
Sarpy County, NE	8.6%	7.6–9.6
Kalawao County, HI	8.6%	7.5–9.8

Twenty counties at each end by point estimate. Small counties have wide intervals; many of these intervals overlap one another, so the order within each list is not a meaningful ranking. CDC: "the data should not be used for ranking the overall health of any county, place, census tract, or ZCTA."

National estimate by release

Release	Crude	Age-adjusted	BRFSS year
2022 release	9.2% 9.0–9.4	9.2%	2020
2023 release	9.7% 9.5–9.9	9.7%	2021
2024 release	9.9% 9.7–10.1	9.9%	2022
2025 release	9.8% 9.6–10.0	9.8%	2023

CDC's US row from each release's county file, for reference. Survey questions and modelling details change between releases; see the release pages.

Questions and answers

How does PLACES define "current asthma among adults"?

A multi-level regression and post-stratification approach was applied to BRFSS and ACS data to compute a detailed probability of having current asthma (reporting ‘yes’ to both of the questions, “Have you ever been told by a doctor, nurse, or other health professional that you have asthma?” and the question, “Do you still have asthma?”). The probability was then applied to the detailed population estimates at the appropriate geographic level to generate the prevalence. The 95% confidence interval was derived using Monte Carlo simulation. Population: All Adults.

What is the national estimate for current Asthma?

9.8% (95% confidence interval 9.6–10.0%) crude and 9.8% age-adjusted in the 2025 release.

Which counties have the highest and lowest estimates?

The highest county point estimate is 15.3% (Todd County, SD) and the lowest 7.8% (Aleutians West Census Area, AK). Because the intervals for neighbouring positions usually overlap, the lists are a reference for point estimates, not a ranking.

Is a higher figure better or worse?

This site does not grade measures. CDC groups them as health outcomes, prevention, health risk behaviors, disability, health status and health-related social needs; for prevention measures such as checkups and screening a higher share reports the service, for the others a higher share reports the condition or circumstance.

Where does this data come from?

CDC PLACES: Local Data for Better Health, 2025 release (data updated 4 Dec 2025); the definition text is CDC's own from its measure definitions pages.

Provenance

Source: Centers for Disease Control and Prevention, PLACES: Local Data for Better Health, 2025 release (data updated 4 Dec 2025), with the 2022, 2023, 2024 releases for reference; US government work, public domain. Dataset on data.cdc.gov. Boundaries and ZIP-to-county relationships: US Census Bureau. Percentages are shown to one decimal as CDC publishes them; state figures are population-weighted means computed by this site. Definition text is CDC's own, from the PLACES measure definitions pages (public domain), with its burden narrative and references omitted. Processing errors are corrected at the next daily build; see corrections. Generated 30 Sep 2026.