RANKING · 2025 ESTIMATES · 58 SHOWN OF 58

Fastest shrinking, California counties

California counties with the steepest population decline from the 2020 census to 2025. 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 by population Fastest growing Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Lassen County, CACA28,117-14.1%−162%

02Alpine County, CACA1,043-13.4%−257%

03Plumas County, CACA18,583-6.1%−211%

04San Francisco County, CACA826,079-5.5%−175%

05Mono County, CACA12,505-5.2%−118%

06Del Norte County, CACA26,410-4.8%−128%

07Siskiyou County, CACA42,013-4.7%−365%

08Inyo County, CACA18,158-4.5%+145%

09Santa Cruz County, CACA258,852-4.4%−139%

10Tuolumne County, CACA53,160-4.4%−135%

11Sierra County, CACA3,098-4.3%−160%

12Mendocino County, CACA88,122-3.8%−152%

13Napa County, CACA132,949-3.7%−130%

14Humboldt County, CACA131,647-3.5%−157%

15Marin County, CACA253,694-3.3%−144%

16Los Angeles County, CACA9,694,934-3.2%−143%

17Modoc County, CACA8,426-3.1%+33%

18San Mateo County, CACA743,568-2.7%−131%

19Alameda County, CACA1,636,630-2.7%−121%

20Glenn County, CACA28,141-2.7%−140%

21Trinity County, CACA15,720-2.4%+675%

22Tehama County, CACA64,665-1.8%−114%

23Ventura County, CACA830,851-1.5%−112%

24Santa Barbara County, CACA442,065-1.4%−117%

25Mariposa County, CACA16,918-1.2%−106%

26Monterey County, CACA433,729-1.2%−109%

27Orange County, CACA3,149,507-1.2%−107%

28Butte County, CACA209,211-1.1%−110%

29Santa Clara County, CACA1,914,391-1.1%−109%

30Sutter County, CACA98,787-0.8%−104%

31Lake County, CACA67,772-0.6%−104%

32San Diego County, CACA3,282,248-0.5%−104%

33Sonoma County, CACA486,444-0.5%−103%

34Nevada County, CACA101,911-0.3%−102%

35Shasta County, CACA181,648-0.3%−103%

36San Luis Obispo County, CACA282,367-0.0%−100%

37Colusa County, CACA21,836-0.0%−100%

38Contra Costa County, CACA1,170,070+0.4%−98%

39Solano County, CACA455,376+0.4%−97%

40El Dorado County, CACA192,323+0.6%−98%

41Stanislaus County, CACA557,719+0.9%−96%

42Imperial County, CACA181,411+1.0%−97%

43Kings County, CACA154,327+1.2%−96%

44San Bernardino County, CACA2,224,091+1.9%−91%

45Kern County, CACA927,068+2.0%−91%

46Sacramento County, CACA1,618,460+2.1%−88%

47Tulare County, CACA485,146+2.5%−86%

48Fresno County, CACA1,035,456+2.7%−87%

49Calaveras County, CACA46,605+2.9%−89%

50Amador County, CACA41,876+3.5%−79%

51Yolo County, CACA224,410+3.7%−81%

52Riverside County, CACA2,544,916+5.2%−84%

53Merced County, CACA297,260+5.7%−68%

54San Joaquin County, CACA823,815+5.7%−67%

55Madera County, CACA167,927+7.5%−81%

56Yuba County, CACA88,691+8.7%+155%

57San Benito County, CACA70,082+9.1%−80%

58Placer County, CACA442,081+9.2%−79%

SHOWING 1–58 OF 58

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