RANKING · 2025 ESTIMATES · 58 SHOWN OF 58

Most sparsely populated, California counties

California counties with the fewest residents per square mile (2025). This list covers the 58 counties in California that qualify, ranked against each other statewide.

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RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most population lost Most densely populated

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Alpine County, CACA1,0431–

02Inyo County, CACA18,1582–

03Modoc County, CACA8,4262–

04Sierra County, CACA3,0983–

05Mono County, CACA12,5054–

06Trinity County, CACA15,7205–

07Lassen County, CACA28,1176–

08Siskiyou County, CACA42,0137–

09Plumas County, CACA18,5837–

10Mariposa County, CACA16,91812–

11Colusa County, CACA21,83619–

12Glenn County, CACA28,14121–

13Tehama County, CACA64,66522–

14Tuolumne County, CACA53,16024–

15Mendocino County, CACA88,12225–

16Del Norte County, CACA26,41026–

17Humboldt County, CACA131,64737–

18Imperial County, CACA181,41143–

19Calaveras County, CACA46,60546–

20Shasta County, CACA181,64848–

21San Benito County, CACA70,08250–

22Lake County, CACA67,77254–

23Amador County, CACA41,87670–

24Madera County, CACA167,92779–

25San Luis Obispo County, CACA282,36786–

26Tulare County, CACA485,146101–

27Nevada County, CACA101,911106–

28San Bernardino County, CACA2,224,091111–

29Kings County, CACA154,327111–

30El Dorado County, CACA192,323113–

31Kern County, CACA927,068114–

32Butte County, CACA209,211128–

33Monterey County, CACA433,729132–

34Yuba County, CACA88,691140–

35Merced County, CACA297,260153–

36Santa Barbara County, CACA442,065162–

37Sutter County, CACA98,787164–

38Fresno County, CACA1,035,456174–

39Napa County, CACA132,949177–

40Yolo County, CACA224,410222–

41Sonoma County, CACA486,444309–

42Placer County, CACA442,081314–

43Riverside County, CACA2,544,916353–

44Stanislaus County, CACA557,719373–

45Ventura County, CACA830,851451–

46Marin County, CACA253,694488–

47Solano County, CACA455,376554–

48Santa Cruz County, CACA258,852582–

49San Joaquin County, CACA823,815592–

50San Diego County, CACA3,282,248780–

51Santa Clara County, CACA1,914,3911,483–

52Contra Costa County, CACA1,170,0701,632–

53San Mateo County, CACA743,5681,658–

54Sacramento County, CACA1,618,4601,677–

55Alameda County, CACA1,636,6302,219–

56Los Angeles County, CACA9,694,9342,388–

57Orange County, CACA3,149,5073,972–

58San Francisco County, CACA826,07917,689–

SHOWING 1–58 OF 58

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES