Data / Rankings / COPD in adults, local model estimate / Counties in California

Counties in California by COPD in adults, local model estimate

Trinity County had the highest COPD in adults, local model estimate of 58 counties in 2021, at 11%. Santa Clara County had the lowest, at 3.5%. The median was 6.4%. Source: the Centers for Disease Control and Prevention.

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Highest11Trinity County
Lowest3.5Santa Clara County
Median6.458 counties

Map of counties, 2021

Alameda County: 4 %Alpine County: 7.2 %Amador County: 7.8 %Butte County: 7.2 %Calaveras County: 9 %Colusa County: 6.9 %Contra Costa County: 4.9 %Del Norte County: 8.8 %El Dorado County: 6.4 %Fresno County: 6.3 %Glenn County: 7.9 %Humboldt County: 7.7 %Imperial County: 6.1 %Inyo County: 7.2 %Kern County: 6.6 %Kings County: 6.1 %Lake County: 9.2 %Lassen County: 7.5 %Los Angeles County: 5 %Madera County: 7.3 %Marin County: 5.3 %Mariposa County: 8.5 %Mendocino County: 8.4 %Merced County: 6.4 %Modoc County: 10.1 %Mono County: 6.3 %Monterey County: 5.9 %Napa County: 5.8 %Nevada County: 7.3 %Orange County: 4.8 %Placer County: 5.5 %Plumas County: 8.5 %Riverside County: 5.8 %Sacramento County: 5.7 %San Benito County: 5 %San Bernardino County: 5.6 %San Diego County: 4.9 %San Francisco County: 3.8 %San Joaquin County: 5.9 %San Luis Obispo County: 6.1 %San Mateo County: 4 %Santa Barbara County: 5.6 %Santa Clara County: 3.5 %Santa Cruz County: 5.6 %Shasta County: 7.9 %Sierra County: 8.3 %Siskiyou County: 9.3 %Solano County: 5.4 %Sonoma County: 6.2 %Stanislaus County: 6.4 %Sutter County: 6.7 %Tehama County: 8.9 %Trinity County: 11 %Tulare County: 6.7 %Tuolumne County: 7.7 %Ventura County: 5.5 %Yolo County: 5 %Yuba County: 6.9 %
  • Under 5.2
  • 5.2 to 5.8
  • 5.8 to 6.4
  • 6.4 to 7.2
  • 7.2 to 8.4
  • 8.4 and over
%, 2021. Source: CDC, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), copd in adults, crude prevalence. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Trinity County: 11 %Trinity County11Modoc County: 10.1 %Modoc County10.1Siskiyou County: 9.3 %Siskiyou County9.3Lake County: 9.2 %Lake County9.2Calaveras County: 9 %Calaveras County9Tehama County: 8.9 %Tehama County8.9Del Norte County: 8.8 %Del Norte County8.8Mariposa County: 8.5 %Mariposa County8.5Plumas County: 8.5 %Plumas County8.5Mendocino County: 8.4 %Mendocino County8.4Sierra County: 8.3 %Sierra County8.3Glenn County: 7.9 %Glenn County7.9Shasta County: 7.9 %Shasta County7.9Amador County: 7.8 %Amador County7.8Humboldt County: 7.7 %Humboldt County7.7Tuolumne County: 7.7 %Tuolumne County7.7Lassen County: 7.5 %Lassen County7.5Madera County: 7.3 %Madera County7.3Nevada County: 7.3 %Nevada County7.3Alpine County: 7.2 %Alpine County7.2Butte County: 7.2 %Butte County7.2Inyo County: 7.2 %Inyo County7.2Colusa County: 6.9 %Colusa County6.9Yuba County: 6.9 %Yuba County6.9Sutter County: 6.7 %Sutter County6.7Tulare County: 6.7 %Tulare County6.7Kern County: 6.6 %Kern County6.6El Dorado County: 6.4 %El Dorado County6.4Merced County: 6.4 %Merced County6.4Stanislaus County: 6.4 %Stanislaus County6.4Fresno County: 6.3 %Fresno County6.3Mono County: 6.3 %Mono County6.3Sonoma County: 6.2 %Sonoma County6.2Imperial County: 6.1 %Imperial County6.1Kings County: 6.1 %Kings County6.1San Luis Obispo County: 6.1 %San Luis Obispo County6.1Monterey County: 5.9 %Monterey County5.9San Joaquin County: 5.9 %San Joaquin County5.9Napa County: 5.8 %Napa County5.8Riverside County: 5.8 %Riverside County5.8Sacramento County: 5.7 %Sacramento County5.7San Bernardino County: 5.6 %San Bernardino County5.6Santa Barbara County: 5.6 %Santa Barbara County5.6Santa Cruz County: 5.6 %Santa Cruz County5.6Placer County: 5.5 %Placer County5.5Ventura County: 5.5 %Ventura County5.5Solano County: 5.4 %Solano County5.4Marin County: 5.3 %Marin County5.3Los Angeles County: 5 %Los Angeles County5San Benito County: 5 %San Benito County5Yolo County: 5 %Yolo County5Contra Costa County: 4.9 %Contra Costa County4.9San Diego County: 4.9 %San Diego County4.9Orange County: 4.8 %Orange County4.8Alameda County: 4 %Alameda County4San Mateo County: 4 %San Mateo County4San Francisco County: 3.8 %San Francisco County3.8Santa Clara County: 3.5 %Santa Clara County3.5Trinity County: 11 %Trinity County11Modoc County: 10.1 %Modoc County10.1Siskiyou County: 9.3 %Siskiyou County9.3Lake County: 9.2 %Lake County9.2Calaveras County: 9 %Calaveras County9Tehama County: 8.9 %Tehama County8.9Del Norte County: 8.8 %Del Norte County8.8Mariposa County: 8.5 %Mariposa County8.5Plumas County: 8.5 %Plumas County8.5Mendocino County: 8.4 %Mendocino County8.4Sierra County: 8.3 %Sierra County8.3Glenn County: 7.9 %Glenn County7.9Shasta County: 7.9 %Shasta County7.9Amador County: 7.8 %Amador County7.8Humboldt County: 7.7 %Humboldt County7.7Tuolumne County: 7.7 %Tuolumne County7.7Lassen County: 7.5 %Lassen County7.5Madera County: 7.3 %Madera County7.3Nevada County: 7.3 %Nevada County7.3Alpine County: 7.2 %Alpine County7.2Butte County: 7.2 %Butte County7.2Inyo County: 7.2 %Inyo County7.2Colusa County: 6.9 %Colusa County6.9Yuba County: 6.9 %Yuba County6.9Sutter County: 6.7 %Sutter County6.7Tulare County: 6.7 %Tulare County6.7Kern County: 6.6 %Kern County6.6El Dorado County: 6.4 %El Dorado County6.4Merced County: 6.4 %Merced County6.4Stanislaus County: 6.4 %Stanislaus County6.4Fresno County: 6.3 %Fresno County6.3Mono County: 6.3 %Mono County6.3Sonoma County: 6.2 %Sonoma County6.2Imperial County: 6.1 %Imperial County6.1Kings County: 6.1 %Kings County6.1San Luis Obispo County: 6.1 %San Luis Obispo County6.1Monterey County: 5.9 %Monterey County5.9San Joaquin County: 5.9 %San Joaquin County5.9Napa County: 5.8 %Napa County5.8Riverside County: 5.8 %Riverside County5.8Sacramento County: 5.7 %Sacramento County5.7San Bernardino County: 5.6 %San Bernardino County5.6Santa Barbara County: 5.6 %Santa Barbara County5.6Santa Cruz County: 5.6 %Santa Cruz County5.6Placer County: 5.5 %Placer County5.5Ventura County: 5.5 %Ventura County5.5Solano County: 5.4 %Solano County5.4Marin County: 5.3 %Marin County5.3Los Angeles County: 5 %Los Angeles County5San Benito County: 5 %San Benito County5Yolo County: 5 %Yolo County5Contra Costa County: 4.9 %Contra Costa County4.9San Diego County: 4.9 %San Diego County4.9Orange County: 4.8 %Orange County4.8Alameda County: 4 %Alameda County4San Mateo County: 4 %San Mateo County4San Francisco County: 3.8 %San Francisco County3.8Santa Clara County: 3.5 %Santa Clara County3.5
%. Source: CDC, PLACES: Local Data for Better Health, County Data (swc5-untb, fu4u-a9bh, h3ej-a9ec and later releases), copd in adults, crude prevalence. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Trinity County11
2Modoc County10.1
3Siskiyou County9.3
4Lake County9.2
5Calaveras County9
6Tehama County8.9
7Del Norte County8.8
8Mariposa County8.5
8Plumas County8.5
10Mendocino County8.4
11Sierra County8.3
12Glenn County7.9
12Shasta County7.9
14Amador County7.8
15Humboldt County7.7
15Tuolumne County7.7
17Lassen County7.5
18Madera County7.3
18Nevada County7.3
20Alpine County7.2
20Butte County7.2
20Inyo County7.2
23Colusa County6.9
23Yuba County6.9
25Sutter County6.7
25Tulare County6.7
27Kern County6.6
28El Dorado County6.4
28Merced County6.4
28Stanislaus County6.4
31Fresno County6.3
31Mono County6.3
33Sonoma County6.2
34Imperial County6.1
34Kings County6.1
34San Luis Obispo County6.1
37Monterey County5.9
37San Joaquin County5.9
39Napa County5.8
39Riverside County5.8
41Sacramento County5.7
42San Bernardino County5.6
42Santa Barbara County5.6
42Santa Cruz County5.6
45Placer County5.5
45Ventura County5.5
47Solano County5.4
48Marin County5.3
49Los Angeles County5
49San Benito County5
49Yolo County5
52Contra Costa County4.9
52San Diego County4.9
54Orange County4.8
55Alameda County4
55San Mateo County4
57San Francisco County3.8
58Santa Clara County3.5

Other periods

About this ranking

Percentage of adults who have ever been told by a doctor, nurse or other health professional that they had chronic obstructive pulmonary disease (COPD), emphysema or chronic bronchitis. 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), copd 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), copd in adults, crude prevalence (Counties in California by COPD 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), copd in adults, crude prevalence, Counties in California by COPD 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-copd-rate-county-estimate/california-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), copd in adults, crude prevalence. Counties in California by COPD 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-copd-rate-county-estimate/california-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), copd in adults, crude prevalence, Counties in California by COPD in adults, local model estimate, 2021 [Dataset]. Available at: https://www.cdc.gov/places/, via Invokely: https://invokely.ai/rankings/adult-copd-rate-county-estimate/california-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{centers_counties_in_california_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), copd in adults, crude prevalence: Counties in California by COPD 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-copd-rate-county-estimate/california-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), copd 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), copd in adults, crude prevalence: Counties in California by COPD 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-copd-rate-county-estimate/california-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/adult-copd-rate-county-estimate/california-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), copd 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 California by COPD in adults, local model estimate using official data, and cite the source.
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Questions

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

Trinity County, with 11% in 2021, according to the Centers for Disease Control and Prevention.

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

Santa Clara County, with 3.5% 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), copd in adults, crude prevalence. Retrieved 2026-10-12.

COPD in adults, local model estimate: other rankings

Counties in California: more rankings