RANKING · 2020 CENSUS · 58 SHOWN OF 58

Fastest shrinking, California counties · 2020

California counties with the steepest population decline from the 2010 census to 2020. 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

01Modoc County, CACA8,426-10.2%−7.8 pts

02Mono County, CACA12,505-7.1%−36.2 pts

03Lassen County, CACA28,117-6.2%−28.8 pts

04Mariposa County, CACA16,918-6.1%−25.9 pts

05Butte County, CACA209,211-3.8%−15.4 pts

06Del Norte County, CACA26,410-3.0%−20.3 pts

07Siskiyou County, CACA42,013-1.8%−3.6 pts

08Plumas County, CACA18,583-1.1%−6.6 pts

09Calaveras County, CACA46,605-0.6%−27.4 pts

10Kings County, CACA154,327-0.3%−27.9 pts

11Sierra County, CACA3,098-0.1%−7.3 pts

12Tuolumne County, CACA53,160+0.5%−12.0 pts

13Sonoma County, CACA486,444+1.0%−17.1 pts

14Napa County, CACA132,949+1.1%−11.1 pts

15Humboldt County, CACA131,647+1.4%−4.8 pts

16Colusa County, CACA21,836+2.0%−13.6 pts

17Los Angeles County, CACA9,694,934+2.0%−5.4 pts

18Alpine County, CACA1,043+2.5%−6.1 pts

19Ventura County, CACA830,851+2.5%−10.1 pts

20Inyo County, CACA18,158+2.5%+4.4 pts

21Shasta County, CACA181,648+2.8%−8.2 pts

22Glenn County, CACA28,141+2.8%−3.8 pts

23Imperial County, CACA181,411+3.0%−27.3 pts

24Santa Cruz County, CACA258,852+3.2%−8.0 pts

25Nevada County, CACA101,911+3.5%−13.7 pts

26Madera County, CACA167,927+3.6%−36.2 pts

27Tehama County, CACA64,665+3.7%−9.2 pts

28Marin County, CACA253,694+3.9%−3.5 pts

29Mendocino County, CACA88,122+4.3%−3.1 pts

30San Luis Obispo County, CACA282,367+4.7%−8.9 pts

31Sutter County, CACA98,787+5.2%−17.4 pts

32Lake County, CACA67,772+5.4%−9.8 pts

33El Dorado County, CACA192,323+5.6%−18.5 pts

34Santa Barbara County, CACA442,065+5.7%−2.3 pts

35Monterey County, CACA433,729+5.8%−7.2 pts

36Orange County, CACA3,149,507+5.9%−12.2 pts

37Amador County, CACA41,876+6.3%−10.6 pts

38San Mateo County, CACA743,568+6.4%−2.5 pts

39San Diego County, CACA3,282,248+6.6%−6.1 pts

40Tulare County, CACA485,146+7.0%−11.0 pts

41San Bernardino County, CACA2,224,091+7.2%−13.3 pts

42Stanislaus County, CACA557,719+7.5%−13.2 pts

43Yolo County, CACA224,410+7.7%−11.8 pts

44Kern County, CACA927,068+8.3%−13.5 pts

45Fresno County, CACA1,035,456+8.4%−11.4 pts

46San Francisco County, CACA826,079+8.5%+1.2 pts

47Santa Clara County, CACA1,914,391+8.7%−3.7 pts

48Solano County, CACA455,376+9.7%−6.2 pts

49Merced County, CACA297,260+9.9%−8.1 pts

50Riverside County, CACA2,544,916+10.4%−21.6 pts

51Contra Costa County, CACA1,170,070+11.1%−6.9 pts

52Alameda County, CACA1,636,630+11.4%−1.5 pts

53Sacramento County, CACA1,618,460+11.7%−5.8 pts

54Yuba County, CACA88,691+13.1%+9.6 pts

55San Joaquin County, CACA823,815+13.7%−3.6 pts

56Placer County, CACA442,081+16.2%−27.6 pts

57San Benito County, CACA70,082+16.2%−28.9 pts

58Trinity County, CACA15,720+16.9%+17.2 pts

SHOWING 1–58 OF 58

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