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. The median across all 58 is 6.4%. Biggest climber in the top 100 since 2020: Lassen County, CA, up 28 places to #25.

CaliforniaAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

YEAR2020 2024

RANKPLACESTATEPOPUNINSUREDVS 2020

01▲21Sierra County, CACA3,09813.7%+6.3 pts

02Modoc County, CACA8,42610.0%−0.7 pts

03▲2Monterey County, CACA433,7299.6%+0.2 pts

04▼1Trinity County, CACA15,7209.3%−1.1 pts

05▼4Mono County, CACA12,5058.8%−3.8 pts

06▼2Santa 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

09▲4Merced County, CACA297,2608.1%+0.1 pts

10▲6Tulare County, CACA485,1468.1%+0.3 pts

11▼2Colusa County, CACA21,8368.0%−0.5 pts

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

13▲4Kern County, CACA927,0687.8%+0.1 pts

14▼8Mendocino County, CACA88,1227.7%−1.6 pts

15▼5Riverside County, CACA2,544,9167.7%−0.8 pts

16▲3Madera County, CACA167,9277.4%−0.2 pts

17▲4Kings County, CACA154,3277.3%−0.2 pts

18▼7Ventura County, CACA830,8517.3%−1.1 pts

19▲10Inyo County, CACA18,1587.0%+0.3 pts

20▲3Lake County, CACA67,7726.9%−0.4 pts

21▼7Fresno County, CACA1,035,4566.7%−1.1 pts

22▲18Tehama County, CACA64,6656.6%+0.9 pts

23▲10Shasta County, CACA181,6486.5%+0.3 pts

24▲11Butte County, CACA209,2116.4%+0.4 pts

25▲28Lassen County, CACA28,1176.4%+2.6 pts

26▼2Orange County, CACA3,149,5076.4%−0.7 pts

27▼7San Diego County, CACA3,282,2486.4%−1.2 pts

28Sutter County, CACA98,7876.4%−0.4 pts

29▼4Yuba County, CACA88,6916.4%−0.7 pts

30▲2San Joaquin County, CACA823,8156.3%0.0 pts

31▼5Imperial County, CACA181,4116.0%−1.0 pts

32▼2San Benito County, CACA70,0826.0%−0.5 pts

33▼2Siskiyou County, CACA42,0136.0%−0.4 pts

34▲24Plumas County, CACA18,5835.8%+2.6 pts

35▲3Napa County, CACA132,9495.7%−0.2 pts

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

37▲4Stanislaus County, CACA557,7195.6%0.0 pts

38▲4Del Norte County, CACA26,4105.5%0.0 pts

39Nevada County, CACA101,9115.3%−0.4 pts

40▼6Tuolumne County, CACA53,1605.3%−0.8 pts

41▼14Mariposa County, CACA16,9185.2%−1.6 pts

42▼5Sonoma County, CACA486,4445.1%−0.9 pts

43▲1Calaveras County, CACA46,6055.0%−0.3 pts

44▲2Amador County, CACA41,8764.9%−0.2 pts

45▼30Humboldt County, CACA131,6474.9%−2.9 pts

46▼3Sacramento County, CACA1,618,4604.9%−0.6 pts

47▼2Santa Cruz County, CACA258,8524.9%−0.3 pts

48Solano County, CACA455,3764.8%−0.2 pts

49▲2Yolo County, CACA224,4104.8%+0.5 pts

50▼3Contra Costa County, CACA1,170,0704.6%−0.4 pts

51▼2Alameda County, CACA1,636,6304.0%−0.3 pts

52▼2El Dorado County, CACA192,3233.9%−0.4 pts

53▼1Santa Clara County, CACA1,914,3913.9%−0.3 pts

54▲3Marin County, CACA253,6943.8%+0.6 pts

55▼1San Mateo County, CACA743,5683.8%0.0 pts

56▼38Alpine County, CACA1,0433.7%−3.9 pts

57▼1San Francisco County, CACA826,0793.3%−0.3 pts

58▼3Placer County, CACA442,0813.2%−0.5 pts

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)

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