RANKING · 2010 CENSUS · 58 SHOWN OF 58

Fastest shrinking, California counties · 2010

California counties with the steepest population decline since the prior decennial census. This list covers the 58 counties in California that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Sierra County, CACA3,098-8.9%−224%

02Plumas County, CACA18,583-3.9%−171%

03Alpine County, CACA1,043-2.7%−132%

04Siskiyou County, CACA42,013+1.4%−24%

05Tuolumne County, CACA53,160+1.6%−87%

06San Mateo County, CACA743,568+1.6%−82%

07Mendocino County, CACA88,122+1.8%−75%

08Marin County, CACA253,694+2.1%−72%

09Modoc County, CACA8,426+2.5%−206%

10Santa Cruz County, CACA258,852+2.7%−76%

11Los Angeles County, CACA9,694,934+3.1%−58%

12Lassen County, CACA28,117+3.2%−86%

13Monterey County, CACA433,729+3.3%−74%

14Inyo County, CACA18,158+3.3%−282%

15San Francisco County, CACA826,079+3.7%−50%

16San Benito County, CACA70,082+3.8%−92%

17Del Norte County, CACA26,410+4.0%−77%

18Alameda County, CACA1,636,630+4.6%−64%

19Solano County, CACA455,376+4.8%−70%

20Sonoma County, CACA486,444+5.5%−70%

21Orange County, CACA3,149,507+5.8%−68%

22Trinity County, CACA15,720+5.9%−1969%

23Santa Clara County, CACA1,914,391+5.9%−52%

24Santa Barbara County, CACA442,065+6.1%−24%

25Glenn County, CACA28,141+6.3%−5%

26Humboldt County, CACA131,647+6.4%+3%

27Mariposa County, CACA16,918+6.5%−67%

28Nevada County, CACA101,911+7.3%−58%

29Butte County, CACA209,211+8.3%−28%

30Amador County, CACA41,876+8.5%−49%

31Shasta County, CACA181,648+8.6%−22%

32San Luis Obispo County, CACA282,367+9.3%−32%

33Ventura County, CACA830,851+9.3%−26%

34Napa County, CACA132,949+9.8%−20%

35San Diego County, CACA3,282,248+10.0%−21%

36Mono County, CACA12,505+10.5%−64%

37Contra Costa County, CACA1,170,070+10.6%−41%

38Lake County, CACA67,772+10.9%−28%

39Calaveras County, CACA46,605+12.4%−54%

40Tehama County, CACA64,665+13.2%+2%

41Colusa County, CACA21,836+13.9%−11%

42Stanislaus County, CACA557,719+15.1%−27%

43El Dorado County, CACA192,323+15.8%−34%

44Sacramento County, CACA1,618,460+16.0%−9%

45Fresno County, CACA1,035,456+16.4%−17%

46Kings County, CACA154,327+18.2%−34%

47San Bernardino County, CACA2,224,091+19.1%−7%

48Yolo County, CACA224,410+19.1%−2%

49Yuba County, CACA88,691+19.8%+480%

50Sutter County, CACA98,787+20.0%−11%

51Tulare County, CACA485,146+20.2%+12%

52Merced County, CACA297,260+21.5%+19%

53San Joaquin County, CACA823,815+21.6%+25%

54Madera County, CACA167,927+22.5%−43%

55Imperial County, CACA181,411+22.6%−25%

56Kern County, CACA927,068+26.9%+24%

57Placer County, CACA442,081+40.3%−8%

58Riverside County, CACA2,544,916+41.7%+30%

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES