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

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

Del Norte County had the highest current asthma in adults, local model estimate of 58 counties in 2022, at 11.6%. Santa Clara County had the lowest, at 8.5%. The median was 10.5%. Source: the Centers for Disease Control and Prevention.

Highest11.6Del Norte County
Lowest8.5Santa Clara County
Median10.558 counties

All counties, 2022

Del Norte County: 11.6 %Del Norte County11.6Humboldt County: 11.6 %Humboldt County11.6Mariposa County: 11.1 %Mariposa County11.1Merced County: 11.1 %Merced County11.1Shasta County: 11.1 %Shasta County11.1Siskiyou County: 11.1 %Siskiyou County11.1Yuba County: 11.1 %Yuba County11.1Tehama County: 11 %Tehama County11Madera County: 10.9 %Madera County10.9Modoc County: 10.9 %Modoc County10.9Nevada County: 10.9 %Nevada County10.9Sacramento County: 10.9 %Sacramento County10.9Fresno County: 10.8 %Fresno County10.8Glenn County: 10.8 %Glenn County10.8Lake County: 10.8 %Lake County10.8Trinity County: 10.8 %Trinity County10.8Butte County: 10.7 %Butte County10.7Lassen County: 10.7 %Lassen County10.7Mendocino County: 10.7 %Mendocino County10.7Calaveras County: 10.6 %Calaveras County10.6Colusa County: 10.6 %Colusa County10.6Stanislaus County: 10.6 %Stanislaus County10.6Tulare County: 10.6 %Tulare County10.6Yolo County: 10.6 %Yolo County10.6Amador County: 10.5 %Amador County10.5Kings County: 10.5 %Kings County10.5Monterey County: 10.5 %Monterey County10.5Sierra County: 10.5 %Sierra County10.5Sutter County: 10.5 %Sutter County10.5Tuolumne County: 10.5 %Tuolumne County10.5Inyo County: 10.4 %Inyo County10.4Kern County: 10.4 %Kern County10.4Plumas County: 10.4 %Plumas County10.4San Bernardino County: 10.4 %San Bernardino County10.4Alpine County: 10.3 %Alpine County10.3Imperial County: 10.2 %Imperial County10.2Mono County: 10.2 %Mono County10.2San Luis Obispo County: 10.2 %San Luis Obispo County10.2Santa Cruz County: 10.2 %Santa Cruz County10.2Sonoma County: 10.2 %Sonoma County10.2Placer County: 10.1 %Placer County10.1San Joaquin County: 10.1 %San Joaquin County10.1Napa County: 10 %Napa County10Riverside County: 10 %Riverside County10Solano County: 10 %Solano County10Santa Barbara County: 9.9 %Santa Barbara County9.9El Dorado County: 9.8 %El Dorado County9.8San Benito County: 9.8 %San Benito County9.8Ventura County: 9.8 %Ventura County9.8Contra Costa County: 9.5 %Contra Costa County9.5Marin County: 9.3 %Marin County9.3San Diego County: 9.3 %San Diego County9.3Los Angeles County: 9.1 %Los Angeles County9.1Orange County: 9 %Orange County9Alameda County: 8.9 %Alameda County8.9San Mateo County: 8.6 %San Mateo County8.6San Francisco County: 8.5 %San Francisco County8.5Santa Clara County: 8.5 %Santa Clara County8.5
%. 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

RankCounties2022 (%)Change on 2021
1Del Norte County11.6+1.2 pts
1Humboldt County11.6+0.9 pts
3Mariposa County11.1+1.2 pts
3Merced County11.1+0.9 pts
3Shasta County11.1+0.9 pts
3Siskiyou County11.1+0.7 pts
3Yuba County11.1+0.7 pts
8Tehama County11+0.5 pts
9Madera County10.9+0.3 pts
9Modoc County10.9+0.5 pts
9Nevada County10.9+1.4 pts
9Sacramento County10.9+1 pts
13Fresno County10.8+0.9 pts
13Glenn County10.8+0.6 pts
13Lake County10.8+0.3 pts
13Trinity County10.8+0.4 pts
17Butte County10.7+0.4 pts
17Lassen County10.7+0.9 pts
17Mendocino County10.7+0.6 pts
20Calaveras County10.6+0.7 pts
20Colusa County10.6+0.6 pts
20Stanislaus County10.6+0.4 pts
20Tulare County10.6+0.3 pts
20Yolo County10.6+0.8 pts
25Amador County10.5+1.1 pts
25Kings County10.5+0.5 pts
25Monterey County10.5+1 pts
25Sierra County10.5+1 pts
25Sutter County10.5+0.6 pts
25Tuolumne County10.5+0.9 pts
31Inyo County10.4+0.8 pts
31Kern County10.4+0.2 pts
31Plumas County10.4+0.5 pts
31San Bernardino County10.4+0.8 pts
35Alpine County10.3+0.5 pts
36Imperial County10.2+0.3 pts
36Mono County10.2+0.7 pts
36San Luis Obispo County10.2+0.5 pts
36Santa Cruz County10.2+0.7 pts
36Sonoma County10.2+0.6 pts
41Placer County10.1+0.8 pts
41San Joaquin County10.1+0.4 pts
43Napa County10+0.8 pts
43Riverside County10+0.9 pts
43Solano County10+0.5 pts
46Santa Barbara County9.9+0.1 pts
47El Dorado County9.8+0.3 pts
47San Benito County9.8+0.5 pts
47Ventura County9.8+0.6 pts
50Contra Costa County9.5+0.5 pts
51Marin County9.3+0.3 pts
51San Diego County9.3+0.1 pts
53Los Angeles County9.1-0.1 pts
54Orange County9+0.4 pts
55Alameda County8.9+0.3 pts
56San Mateo County8.6+0.6 pts
57San Francisco County8.5+0.3 pts
57Santa Clara County8.5+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, 2022) [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, 2022. 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?period=2022. 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, 2022. 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?period=2022.

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, 2022 [Dataset]. Available at: https://www.cdc.gov/places/, via Invokely: https://invokely.ai/rankings/adult-asthma-rate-county-estimate/california-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{centers_counties_in_california_by_2022,
  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, 2022}},
  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?period=2022. 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, 2022
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?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-asthma-rate-county-estimate/california-counties?period=2022.
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?

Del Norte County, with 11.6% in 2022, 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 8.5% in 2022.

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