RANKING · 2020 CENSUS · 58 SHOWN OF 58

Most uninsured people, California counties · 2020

California counties with the most residents lacking health insurance, as of the 2020 American Community Survey. Ranked by number of people, not the uninsured rate. This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 10,935.

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SAME RANKING BYCities States Metros

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

RANKPLACESTATEPOPUNINSURED RESIDENTSVS –

01Los Angeles County, CACA9,694,934914,046–

02San Diego County, CACA3,282,248244,072–

03Orange County, CACA3,149,507225,042–

04Riverside County, CACA2,544,916204,878–

05San Bernardino County, CACA2,224,091175,185–

06Sacramento County, CACA1,618,46083,134–

07Santa Clara County, CACA1,914,39181,041–

08Fresno County, CACA1,035,45676,302–

09Ventura County, CACA830,85170,449–

10Alameda County, CACA1,636,63070,389–

11Kern County, CACA927,06866,775–

12Contra Costa County, CACA1,170,07057,133–

13San Joaquin County, CACA823,81546,860–

14Santa Barbara County, CACA442,06543,302–

15Monterey County, CACA433,72939,081–

16Tulare County, CACA485,14635,869–

17San Francisco County, CACA826,07931,049–

18Stanislaus County, CACA557,71930,491–

19Sonoma County, CACA486,44429,765–

20San Mateo County, CACA743,56829,312–

21Solano County, CACA455,37621,737–

22Merced County, CACA297,26021,609–

23San Luis Obispo County, CACA282,36716,434–

24Placer County, CACA442,08114,444–

25Santa Cruz County, CACA258,85214,114–

26Butte County, CACA209,21113,336–

27Imperial County, CACA181,41112,001–

28Madera County, CACA167,92711,242–

29Shasta County, CACA181,64810,935–

30Humboldt County, CACA131,64710,480–

31Kings County, CACA154,32710,122–

32Yolo County, CACA224,4109,433–

33Marin County, CACA253,6948,222–

34El Dorado County, CACA192,3238,174–

35Mendocino County, CACA88,1228,044–

36Napa County, CACA132,9498,025–

37Sutter County, CACA98,7876,459–

38Nevada County, CACA101,9115,617–

39Yuba County, CACA88,6915,344–

40Lake County, CACA67,7724,642–

41San Benito County, CACA70,0824,012–

42Tehama County, CACA64,6653,624–

43Tuolumne County, CACA53,1603,137–

44Siskiyou County, CACA42,0132,786–

45Glenn County, CACA28,1412,549–

46Calaveras County, CACA46,6052,424–

47Amador County, CACA41,8761,817–

48Colusa County, CACA21,8361,815–

49Mono County, CACA12,5051,800–

50Del Norte County, CACA26,4101,370–

51Trinity County, CACA15,7201,280–

52Inyo County, CACA18,1581,183–

53Mariposa County, CACA16,9181,171–

54Modoc County, CACA8,426928–

55Lassen County, CACA28,117797–

56Plumas County, CACA18,583592–

57Sierra County, CACA3,098211–

58Alpine County, CACA1,04388–

SHOWING 1–58 OF 58

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS