RANKING · 2020 CENSUS · 58 SHOWN OF 58

Highest uninsured rate, California counties · 2020

California counties ranked by the share of residents without health insurance (2023 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

RELATEDOldest by median age Youngest by median age Most foreign-born residents Most women Most men Highest disability rate

YEAR2020 2024

RANKPLACESTATEPOPUNINSUREDVS 2000

01Mono County, CACA12,50512.6%–

02Modoc County, CACA8,42610.7%–

03Trinity County, CACA15,72010.4%–

04Santa Barbara County, CACA442,0659.9%–

05Monterey County, CACA433,7299.4%–

06Mendocino County, CACA88,1229.3%–

07Glenn County, CACA28,1419.2%–

08Los Angeles County, CACA9,694,9349.2%–

09Colusa County, CACA21,8368.5%–

10Riverside County, CACA2,544,9168.5%–

11Ventura County, CACA830,8518.4%–

12San Bernardino County, CACA2,224,0918.3%–

13Merced County, CACA297,2608.0%–

14Fresno County, CACA1,035,4567.8%–

15Humboldt County, CACA131,6477.8%–

16Tulare County, CACA485,1467.8%–

17Kern County, CACA927,0687.7%–

18Alpine County, CACA1,0437.6%–

19Madera County, CACA167,9277.6%–

20San Diego County, CACA3,282,2487.6%–

21Kings County, CACA154,3277.5%–

22Sierra County, CACA3,0987.4%–

23Lake County, CACA67,7727.3%–

24Orange County, CACA3,149,5077.1%–

25Yuba County, CACA88,6917.1%–

26Imperial County, CACA181,4117.0%–

27Mariposa County, CACA16,9186.8%–

28Sutter County, CACA98,7876.8%–

29Inyo County, CACA18,1586.7%–

30San Benito County, CACA70,0826.5%–

31Siskiyou County, CACA42,0136.4%–

32San Joaquin County, CACA823,8156.3%–

33Shasta County, CACA181,6486.2%–

34Tuolumne County, CACA53,1606.1%–

35Butte County, CACA209,2116.0%–

36San Luis Obispo County, CACA282,3676.0%–

37Sonoma County, CACA486,4446.0%–

38Napa County, CACA132,9495.9%–

39Nevada County, CACA101,9115.7%–

40Tehama County, CACA64,6655.7%–

41Stanislaus County, CACA557,7195.6%–

42Del Norte County, CACA26,4105.5%–

43Sacramento County, CACA1,618,4605.5%–

44Calaveras County, CACA46,6055.3%–

45Santa Cruz County, CACA258,8525.2%–

46Amador County, CACA41,8765.1%–

47Contra Costa County, CACA1,170,0705.0%–

48Solano County, CACA455,3765.0%–

49Alameda County, CACA1,636,6304.3%–

50El Dorado County, CACA192,3234.3%–

51Yolo County, CACA224,4104.3%–

52Santa Clara County, CACA1,914,3914.2%–

53Lassen County, CACA28,1173.8%–

54San Mateo County, CACA743,5683.8%–

55Placer County, CACA442,0813.7%–

56San Francisco County, CACA826,0793.6%–

57Marin County, CACA253,6943.2%–

58Plumas County, CACA18,5833.2%–

SHOWING 1–58 OF 58

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES