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.

CaliforniaAll states All rankings

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%+6.3 pts

02Modoc County, CACA8,42610.0%−0.7 pts

03Monterey County, CACA433,7299.6%+0.2 pts

04Trinity County, CACA15,7209.3%−1.1 pts

05Mono County, CACA12,5058.8%−3.8 pts

06Santa Barbara County, CACA442,0658.7%−1.2 pts

07Glenn County, CACA28,1418.5%−0.7 pts

08Los Angeles County, CACA9,694,9348.2%−1.0 pts

09Merced County, CACA297,2608.1%+0.1 pts

10Tulare County, CACA485,1468.1%+0.3 pts

11Colusa County, CACA21,8368.0%−0.5 pts

12San Bernardino County, CACA2,224,0918.0%−0.3 pts

13Kern County, CACA927,0687.8%+0.1 pts

14Mendocino County, CACA88,1227.7%−1.6 pts

15Riverside County, CACA2,544,9167.7%−0.8 pts

16Madera County, CACA167,9277.4%−0.2 pts

17Kings County, CACA154,3277.3%−0.2 pts

18Ventura County, CACA830,8517.3%−1.1 pts

19Inyo County, CACA18,1587.0%+0.3 pts

20Lake County, CACA67,7726.9%−0.4 pts

21Fresno County, CACA1,035,4566.7%−1.1 pts

22Tehama County, CACA64,6656.6%+0.9 pts

23Shasta County, CACA181,6486.5%+0.3 pts

24Butte County, CACA209,2116.4%+0.4 pts

25Lassen County, CACA28,1176.4%+2.6 pts

26Orange County, CACA3,149,5076.4%−0.7 pts

27San Diego County, CACA3,282,2486.4%−1.2 pts

28Sutter County, CACA98,7876.4%−0.4 pts

29Yuba County, CACA88,6916.4%−0.7 pts

30San Joaquin County, CACA823,8156.3%+0.0 pts

31Imperial County, CACA181,4116.0%−1.0 pts

32San Benito County, CACA70,0826.0%−0.5 pts

33Siskiyou County, CACA42,0136.0%−0.4 pts

34Plumas County, CACA18,5835.8%+2.6 pts

35Napa County, CACA132,9495.7%−0.2 pts

36San Luis Obispo County, CACA282,3675.7%−0.3 pts

37Stanislaus County, CACA557,7195.6%+0.0 pts

38Del Norte County, CACA26,4105.5%+0.0 pts

39Nevada County, CACA101,9115.3%−0.4 pts

40Tuolumne County, CACA53,1605.3%−0.8 pts

41Mariposa County, CACA16,9185.2%−1.6 pts

42Sonoma County, CACA486,4445.1%−0.9 pts

43Calaveras County, CACA46,6055.0%−0.3 pts

44Amador County, CACA41,8764.9%−0.2 pts

45Humboldt County, CACA131,6474.9%−2.9 pts

46Sacramento County, CACA1,618,4604.9%−0.6 pts

47Santa Cruz County, CACA258,8524.9%−0.3 pts

48Solano County, CACA455,3764.8%−0.2 pts

49Yolo County, CACA224,4104.8%+0.5 pts

50Contra Costa County, CACA1,170,0704.6%−0.4 pts

51Alameda County, CACA1,636,6304.0%−0.3 pts

52El Dorado County, CACA192,3233.9%−0.4 pts

53Santa Clara County, CACA1,914,3913.9%−0.3 pts

54Marin County, CACA253,6943.8%+0.6 pts

55San Mateo County, CACA743,5683.8%+0.0 pts

56Alpine County, CACA1,0433.7%−3.9 pts

57San Francisco County, CACA826,0793.3%−0.3 pts

58Placer County, CACA442,0813.2%−0.5 pts

SHOWING 1–58 OF 58

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES