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%−36.7 pts

02Alpine County, CACA1,043-13.4%−21.9 pts

03Plumas County, CACA18,583-6.1%−11.6 pts

04San Francisco County, CACA826,079-5.5%−12.8 pts

05Mono County, CACA12,505-5.2%−34.3 pts

06Del Norte County, CACA26,410-4.8%−22.1 pts

07Siskiyou County, CACA42,013-4.7%−6.4 pts

08Inyo County, CACA18,158-4.5%−2.7 pts

09Santa Cruz County, CACA258,852-4.4%−15.7 pts

10Tuolumne County, CACA53,160-4.4%−16.9 pts

11Sierra County, CACA3,098-4.3%−11.4 pts

12Mendocino County, CACA88,122-3.8%−11.2 pts

13Napa County, CACA132,949-3.7%−15.9 pts

14Humboldt County, CACA131,647-3.5%−9.7 pts

15Marin County, CACA253,694-3.3%−10.8 pts

16Los Angeles County, CACA9,694,934-3.2%−10.6 pts

17Modoc County, CACA8,426-3.1%−0.8 pts

18San Mateo County, CACA743,568-2.7%−11.6 pts

19Alameda County, CACA1,636,630-2.7%−15.6 pts

20Glenn County, CACA28,141-2.7%−9.4 pts

21Trinity County, CACA15,720-2.4%−2.1 pts

22Tehama County, CACA64,665-1.8%−14.7 pts

23Ventura County, CACA830,851-1.5%−14.1 pts

24Santa Barbara County, CACA442,065-1.4%−9.4 pts

25Mariposa County, CACA16,918-1.2%−21.0 pts

26Monterey County, CACA433,729-1.2%−14.2 pts

27Orange County, CACA3,149,507-1.2%−19.3 pts

28Butte County, CACA209,211-1.1%−12.7 pts

29Santa Clara County, CACA1,914,391-1.1%−13.5 pts

30Sutter County, CACA98,787-0.8%−23.4 pts

31Lake County, CACA67,772-0.6%−15.7 pts

32San Diego County, CACA3,282,248-0.5%−13.1 pts

33Sonoma County, CACA486,444-0.5%−18.6 pts

34Nevada County, CACA101,911-0.3%−17.5 pts

35Shasta County, CACA181,648-0.3%−11.3 pts

36San Luis Obispo County, CACA282,367-0.0%−13.6 pts

37Colusa County, CACA21,836-0.0%−15.6 pts

38Contra Costa County, CACA1,170,070+0.4%−17.7 pts

39Solano County, CACA455,376+0.4%−15.5 pts

40El Dorado County, CACA192,323+0.6%−23.5 pts

41Stanislaus County, CACA557,719+0.9%−19.8 pts

42Imperial County, CACA181,411+1.0%−29.3 pts

43Kings County, CACA154,327+1.2%−26.4 pts

44San Bernardino County, CACA2,224,091+1.9%−18.6 pts

45Kern County, CACA927,068+2.0%−19.8 pts

46Sacramento County, CACA1,618,460+2.1%−15.4 pts

47Tulare County, CACA485,146+2.5%−15.4 pts

48Fresno County, CACA1,035,456+2.7%−17.1 pts

49Calaveras County, CACA46,605+2.9%−23.8 pts

50Amador County, CACA41,876+3.5%−13.4 pts

51Yolo County, CACA224,410+3.7%−15.8 pts

52Riverside County, CACA2,544,916+5.2%−26.8 pts

53Merced County, CACA297,260+5.7%−12.3 pts

54San Joaquin County, CACA823,815+5.7%−11.5 pts

55Madera County, CACA167,927+7.5%−32.3 pts

56Yuba County, CACA88,691+8.7%+5.3 pts

57San Benito County, CACA70,082+9.1%−35.9 pts

58Placer County, CACA442,081+9.2%−34.5 pts

SHOWING 1–58 OF 58

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES