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. The median across all 58 is 10,557. Biggest climber in the top 100 since 2020: Lassen County, CA, up 6 places to #49.

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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%

08▲3Kern County, CACA927,06869,993+5%

09▼1Fresno County, CACA1,035,45666,826−12%

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

11▼2Ventura County, CACA830,85160,259−14%

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

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

14▲1Monterey County, CACA433,72940,441+3%

15▲1Tulare County, CACA485,14638,327+7%

16▼2Santa Barbara County, CACA442,06537,873−13%

17▲1Stanislaus County, CACA557,71931,089+2%

18▲2San Mateo County, CACA743,56828,082−4%

19▼2San Francisco County, CACA826,07927,184−12%

20▼1Sonoma County, CACA486,44424,564−17%

21▲1Merced County, CACA297,26023,382+8%

22▼1Solano County, CACA455,37621,134−3%

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

24Placer County, CACA442,08113,224−8%

25▲1Butte County, CACA209,21113,177−1%

26▼1Santa Cruz County, CACA258,85212,976−8%

27▲2Shasta County, CACA181,64811,616+6%

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

29▲3Yolo County, CACA224,41010,557+12%

30▼3Imperial County, CACA181,41110,427−13%

31Kings County, CACA154,3279,955−2%

32▲1Marin County, CACA253,6949,600+17%

33▲3Napa County, CACA132,9497,646−5%

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

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

36▼6Humboldt 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, CACA67,7724,6560%

41▲1Tehama County, CACA64,6654,257+17%

42▼1San Benito County, CACA70,0823,9990%

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%

49▲6Lassen County, CACA28,1171,526+91%

50▲1Trinity County, CACA15,7201,463+14%

51▼1Del Norte County, CACA26,4101,3670%

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

53▼4Mono County, CACA12,5051,146−36%

54▲2Plumas County, CACA18,5831,127+90%

55▼2Mariposa County, CACA16,918881−25%

56▼2Modoc County, CACA8,426842−9%

57Sierra County, CACA3,098363+72%

58Alpine County, CACA1,04359−33%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES