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

Counties in California by current asthma in adults, local model estimate, 2023

Humboldt County had the highest current asthma in adults, local model estimate of 58 counties in 2023, at 11%. Santa Clara County had the lowest, at 7.9%. The median was 10%. Source: the Centers for Disease Control and Prevention.

Highest11Humboldt County
Lowest7.9Santa Clara County
Median1058 counties

All counties, 2023

Humboldt County: 11 %Humboldt County11Siskiyou County: 11 %Siskiyou County11Trinity County: 11 %Trinity County11Del Norte County: 10.8 %Del Norte County10.8Lake County: 10.8 %Lake County10.8Modoc County: 10.8 %Modoc County10.8Shasta County: 10.8 %Shasta County10.8Tehama County: 10.7 %Tehama County10.7Mendocino County: 10.6 %Mendocino County10.6Plumas County: 10.6 %Plumas County10.6Sierra County: 10.6 %Sierra County10.6Butte County: 10.5 %Butte County10.5Madera County: 10.4 %Madera County10.4Yuba County: 10.4 %Yuba County10.4Calaveras County: 10.3 %Calaveras County10.3Kern County: 10.3 %Kern County10.3Lassen County: 10.3 %Lassen County10.3Mariposa County: 10.3 %Mariposa County10.3Tuolumne County: 10.3 %Tuolumne County10.3Alpine County: 10.2 %Alpine County10.2Inyo County: 10.2 %Inyo County10.2Nevada County: 10.2 %Nevada County10.2Sacramento County: 10.2 %Sacramento County10.2Glenn County: 10.1 %Glenn County10.1Solano County: 10.1 %Solano County10.1Amador County: 10 %Amador County10Stanislaus County: 10 %Stanislaus County10Sutter County: 10 %Sutter County10Tulare County: 10 %Tulare County10Fresno County: 9.9 %Fresno County9.9Mono County: 9.9 %Mono County9.9Placer County: 9.9 %Placer County9.9San Bernardino County: 9.9 %San Bernardino County9.9San Luis Obispo County: 9.9 %San Luis Obispo County9.9Colusa County: 9.8 %Colusa County9.8El Dorado County: 9.8 %El Dorado County9.8Kings County: 9.8 %Kings County9.8Merced County: 9.8 %Merced County9.8Santa Cruz County: 9.8 %Santa Cruz County9.8Sonoma County: 9.8 %Sonoma County9.8Yolo County: 9.8 %Yolo County9.8Santa Barbara County: 9.7 %Santa Barbara County9.7Monterey County: 9.6 %Monterey County9.6Napa County: 9.5 %Napa County9.5Riverside County: 9.5 %Riverside County9.5San Joaquin County: 9.5 %San Joaquin County9.5Ventura County: 9.5 %Ventura County9.5Contra Costa County: 9.4 %Contra Costa County9.4Marin County: 9.4 %Marin County9.4Imperial County: 9.2 %Imperial County9.2San Benito County: 9.2 %San Benito County9.2Los Angeles County: 9.1 %Los Angeles County9.1Orange County: 9 %Orange County9San Diego County: 8.9 %San Diego County8.9Alameda County: 8.8 %Alameda County8.8San Mateo County: 8.5 %San Mateo County8.5San Francisco County: 8.4 %San Francisco County8.4Santa Clara County: 7.9 %Santa Clara County7.9
%. 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

RankCounties2023 (%)Change on 2022
1Humboldt County11-0.6 pts
1Siskiyou County11-0.1 pts
1Trinity County11+0.2 pts
4Del Norte County10.8-0.8 pts
4Lake County10.80 pts
4Modoc County10.8-0.1 pts
4Shasta County10.8-0.3 pts
8Tehama County10.7-0.3 pts
9Mendocino County10.6-0.1 pts
9Plumas County10.6+0.2 pts
9Sierra County10.6+0.1 pts
12Butte County10.5-0.2 pts
13Madera County10.4-0.5 pts
13Yuba County10.4-0.7 pts
15Calaveras County10.3-0.3 pts
15Kern County10.3-0.1 pts
15Lassen County10.3-0.4 pts
15Mariposa County10.3-0.8 pts
15Tuolumne County10.3-0.2 pts
20Alpine County10.2-0.1 pts
20Inyo County10.2-0.2 pts
20Nevada County10.2-0.7 pts
20Sacramento County10.2-0.7 pts
24Glenn County10.1-0.7 pts
24Solano County10.1+0.1 pts
26Amador County10-0.5 pts
26Stanislaus County10-0.6 pts
26Sutter County10-0.5 pts
26Tulare County10-0.6 pts
30Fresno County9.9-0.9 pts
30Mono County9.9-0.3 pts
30Placer County9.9-0.2 pts
30San Bernardino County9.9-0.5 pts
30San Luis Obispo County9.9-0.3 pts
35Colusa County9.8-0.8 pts
35El Dorado County9.80 pts
35Kings County9.8-0.7 pts
35Merced County9.8-1.3 pts
35Santa Cruz County9.8-0.4 pts
35Sonoma County9.8-0.4 pts
35Yolo County9.8-0.8 pts
42Santa Barbara County9.7-0.2 pts
43Monterey County9.6-0.9 pts
44Napa County9.5-0.5 pts
44Riverside County9.5-0.5 pts
44San Joaquin County9.5-0.6 pts
44Ventura County9.5-0.3 pts
48Contra Costa County9.4-0.1 pts
48Marin County9.4+0.1 pts
50Imperial County9.2-1 pts
50San Benito County9.2-0.6 pts
52Los Angeles County9.10 pts
53Orange County90 pts
54San Diego County8.9-0.4 pts
55Alameda County8.8-0.1 pts
56San Mateo County8.5-0.1 pts
57San Francisco County8.4-0.1 pts
58Santa Clara County7.9-0.6 pts

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 California by current asthma in adults, local model estimate, 2023) [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 California by current asthma in adults, local model estimate, 2023. Centers for Disease Control and Prevention, 4 Dec. 2025, https://www.cdc.gov/places/. Invokely, https://invokely.ai/rankings/adult-asthma-rate-county-estimate/california-counties. 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 California by current asthma in adults, local model estimate, 2023. Dataset. Accessed October 12, 2026. https://www.cdc.gov/places/. Also distributed by Invokely, https://invokely.ai/rankings/adult-asthma-rate-county-estimate/california-counties.

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 California by current asthma in adults, local model estimate, 2023 [Dataset]. Available at: https://www.cdc.gov/places/, via Invokely: https://invokely.ai/rankings/adult-asthma-rate-county-estimate/california-counties (Accessed: 12 October 2026).

BibTeX
@misc{centers_counties_in_california_by_2023,
  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 California by current asthma in adults, local model estimate, 2023}},
  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/california-counties. 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 California by current asthma in adults, local model estimate, 2023
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/california-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-asthma-rate-county-estimate/california-counties.
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?

Humboldt County, with 11% in 2023, according to the Centers for Disease Control and Prevention.

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

Santa Clara County, with 7.9% in 2023.

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 California: more rankings