RANKING · 2020 CENSUS · 58 SHOWN OF 58

Highest Medicare coverage, California counties · 2020

California counties ranked by the share of people covered by Medicare, alone or in combination with other coverage (2020 ACS). A close proxy for retirement geography. 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

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

RANKPLACESTATEPOPMEDICAREVS –

01Amador County, CACA41,87632.4%–

02Trinity County, CACA15,72032.4%–

03Sierra County, CACA3,09831.3%–

04Mariposa County, CACA16,91831.1%–

05Tuolumne County, CACA53,16030.6%–

06Calaveras County, CACA46,60530.3%–

07Alpine County, CACA1,04329.7%–

08Modoc County, CACA8,42629.6%–

09Nevada County, CACA101,91129.3%–

10Plumas County, CACA18,58329.2%–

11Siskiyou County, CACA42,01328.8%–

12Lake County, CACA67,77228.2%–

13Inyo County, CACA18,15825.5%–

14Shasta County, CACA181,64823.9%–

15Mendocino County, CACA88,12223.6%–

16Tehama County, CACA64,66523.4%–

17Lassen County, CACA28,11723.2%–

18El Dorado County, CACA192,32322.9%–

19Marin County, CACA253,69422.5%–

20Del Norte County, CACA26,41022.4%–

21San Luis Obispo County, CACA282,36721.1%–

22Butte County, CACA209,21120.6%–

23Humboldt County, CACA131,64720.6%–

24Sonoma County, CACA486,44420.5%–

25Placer County, CACA442,08120.2%–

26Napa County, CACA132,94919.7%–

27Glenn County, CACA28,14119.1%–

28Santa Cruz County, CACA258,85217.6%–

29Solano County, CACA455,37617.1%–

30Tulare County, CACA485,14616.9%–

31Sutter County, CACA98,78716.8%–

32Contra Costa County, CACA1,170,07016.5%–

33Ventura County, CACA830,85116.5%–

34Kings County, CACA154,32716.3%–

35San Francisco County, CACA826,07916.1%–

36Santa Barbara County, CACA442,06516.1%–

37Yuba County, CACA88,69116.1%–

38Mono County, CACA12,50516.0%–

39Madera County, CACA167,92715.9%–

40San Mateo County, CACA743,56815.9%–

41Sacramento County, CACA1,618,46015.7%–

42Riverside County, CACA2,544,91615.6%–

43Imperial County, CACA181,41115.5%–

44Colusa County, CACA21,83615.4%–

45San Diego County, CACA3,282,24815.3%–

46Orange County, CACA3,149,50715.1%–

47Stanislaus County, CACA557,71914.8%–

48Monterey County, CACA433,72914.4%–

49Alameda County, CACA1,636,63014.2%–

50Los Angeles County, CACA9,694,93414.2%–

51San Joaquin County, CACA823,81513.9%–

52San Benito County, CACA70,08213.7%–

53Fresno County, CACA1,035,45613.6%–

54Santa Clara County, CACA1,914,39113.6%–

55San Bernardino County, CACA2,224,09113.0%–

56Kern County, CACA927,06812.8%–

57Merced County, CACA297,26012.8%–

58Yolo County, CACA224,41012.8%–

SHOWING 1–58 OF 58

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS