RANKING · 2024 ACS · 58 SHOWN OF 58

Highest uninsured rate, California counties

California counties ranked by the share of residents without health insurance (2024 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR2020 2024

RANKPLACESTATEPOPUNINSUREDVS 2020

01Sierra County, CACA3,09813.7%+85%

02Modoc County, CACA8,42610.0%−7%

03Monterey County, CACA433,7299.6%+2%

04Trinity County, CACA15,7209.3%−11%

05Mono County, CACA12,5058.8%−30%

06Santa Barbara County, CACA442,0658.7%−12%

07Glenn County, CACA28,1418.5%−8%

08Los Angeles County, CACA9,694,9348.2%−11%

09Merced County, CACA297,2608.1%+1%

10Tulare County, CACA485,1468.1%+4%

11Colusa County, CACA21,8368.0%−6%

12San Bernardino County, CACA2,224,0918.0%−4%

13Kern County, CACA927,0687.8%+1%

14Mendocino County, CACA88,1227.7%−17%

15Riverside County, CACA2,544,9167.7%−9%

16Madera County, CACA167,9277.4%−3%

17Kings County, CACA154,3277.3%−3%

18Ventura County, CACA830,8517.3%−13%

19Inyo County, CACA18,1587.0%+4%

20Lake County, CACA67,7726.9%−5%

21Fresno County, CACA1,035,4566.7%−14%

22Tehama County, CACA64,6656.6%+16%

23Shasta County, CACA181,6486.5%+5%

24Butte County, CACA209,2116.4%+7%

25Lassen County, CACA28,1176.4%+68%

26Orange County, CACA3,149,5076.4%−10%

27San Diego County, CACA3,282,2486.4%−16%

28Sutter County, CACA98,7876.4%−6%

29Yuba County, CACA88,6916.4%−10%

30San Joaquin County, CACA823,8156.3%+0%

31Imperial County, CACA181,4116.0%−14%

32San Benito County, CACA70,0826.0%−8%

33Siskiyou County, CACA42,0136.0%−6%

34Plumas County, CACA18,5835.8%+81%

35Napa County, CACA132,9495.7%−3%

36San Luis Obispo County, CACA282,3675.7%−5%

37Stanislaus County, CACA557,7195.6%+0%

38Del Norte County, CACA26,4105.5%+0%

39Nevada County, CACA101,9115.3%−7%

40Tuolumne County, CACA53,1605.3%−13%

41Mariposa County, CACA16,9185.2%−24%

42Sonoma County, CACA486,4445.1%−15%

43Calaveras County, CACA46,6055.0%−6%

44Amador County, CACA41,8764.9%−4%

45Humboldt County, CACA131,6474.9%−37%

46Sacramento County, CACA1,618,4604.9%−11%

47Santa Cruz County, CACA258,8524.9%−6%

48Solano County, CACA455,3764.8%−4%

49Yolo County, CACA224,4104.8%+12%

50Contra Costa County, CACA1,170,0704.6%−8%

51Alameda County, CACA1,636,6304.0%−7%

52El Dorado County, CACA192,3233.9%−9%

53Santa Clara County, CACA1,914,3913.9%−7%

54Marin County, CACA253,6943.8%+19%

55San Mateo County, CACA743,5683.8%+0%

56Alpine County, CACA1,0433.7%−51%

57San Francisco County, CACA826,0793.3%−8%

58Placer County, CACA442,0813.2%−14%

SHOWING 1–58 OF 58

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES