RANKING · 2024 ACS · 58 SHOWN OF 58

Most uninsured people, California counties

California counties with the most residents lacking health insurance, as of the 2024 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.

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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 2020

01Los Angeles County, CACA9,694,934800,248−12%

02San Diego County, CACA3,282,248203,475−17%

03Orange County, CACA3,149,507202,047−10%

04Riverside County, CACA2,544,916189,888−7%

05San Bernardino County, CACA2,224,091173,351−1%

06Sacramento County, CACA1,618,46077,190−7%

07Santa Clara County, CACA1,914,39173,684−9%

08Kern County, CACA927,06869,993+5%

09Fresno County, CACA1,035,45666,826−12%

10Alameda County, CACA1,636,63065,034−8%

11Ventura County, CACA830,85160,259−14%

12Contra Costa County, CACA1,170,07053,742−6%

13San Joaquin County, CACA823,81549,452+6%

14Monterey County, CACA433,72940,441+3%

15Tulare County, CACA485,14638,327+7%

16Santa Barbara County, CACA442,06537,873−13%

17Stanislaus County, CACA557,71931,089+2%

18San Mateo County, CACA743,56828,082−4%

19San Francisco County, CACA826,07927,184−12%

20Sonoma County, CACA486,44424,564−17%

21Merced County, CACA297,26023,382+8%

22Solano County, CACA455,37621,134−3%

23San Luis Obispo County, CACA282,36715,808−4%

24Placer County, CACA442,08113,224−8%

25Butte County, CACA209,21113,177−1%

26Santa Cruz County, CACA258,85212,976−8%

27Shasta County, CACA181,64811,616+6%

28Madera County, CACA167,92711,373+1%

29Yolo County, CACA224,41010,557+12%

30Imperial County, CACA181,41110,427−13%

31Kings County, CACA154,3279,955−2%

32Marin County, CACA253,6949,600+17%

33Napa County, CACA132,9497,646−5%

34El Dorado County, CACA192,3237,468−9%

35Mendocino County, CACA88,1226,891−14%

36Humboldt County, CACA131,6476,485−38%

37Sutter County, CACA98,7876,202−4%

38Nevada County, CACA101,9115,370−4%

39Yuba County, CACA88,6915,256−2%

40Lake County, CACA67,7724,656+0%

41Tehama County, CACA64,6654,257+17%

42San Benito County, CACA70,0823,999−0%

43Tuolumne County, CACA53,1602,755−12%

44Siskiyou County, CACA42,0132,586−7%

45Glenn County, CACA28,1412,411−5%

46Calaveras County, CACA46,6052,312−5%

47Amador County, CACA41,8761,870+3%

48Colusa County, CACA21,8361,749−4%

49Lassen County, CACA28,1171,526+91%

50Trinity County, CACA15,7201,463+14%

51Del Norte County, CACA26,4101,367−0%

52Inyo County, CACA18,1581,279+8%

53Mono County, CACA12,5051,146−36%

54Plumas County, CACA18,5831,127+90%

55Mariposa County, CACA16,918881−25%

56Modoc County, CACA8,426842−9%

57Sierra County, CACA3,098363+72%

58Alpine County, CACA1,04359−33%

SHOWING 1–58 OF 58

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