RANKING · 2020 CENSUS · 58 SHOWN OF 58

Fastest growing, California counties · 2020

California counties ranked by population growth 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Trinity County, CACA15,720+16.9%−5476%

02San Benito County, CACA70,082+16.2%−64%

03Placer County, CACA442,081+16.2%−63%

04San Joaquin County, CACA823,815+13.7%−21%

05Yuba County, CACA88,691+13.1%+282%

06Sacramento County, CACA1,618,460+11.7%−33%

07Alameda County, CACA1,636,630+11.4%−11%

08Contra Costa County, CACA1,170,070+11.1%−38%

09Riverside County, CACA2,544,916+10.4%−67%

10Merced County, CACA297,260+9.9%−45%

11Solano County, CACA455,376+9.7%−39%

12Santa Clara County, CACA1,914,391+8.7%−30%

13San Francisco County, CACA826,079+8.5%+17%

14Fresno County, CACA1,035,456+8.4%−57%

15Kern County, CACA927,068+8.3%−62%

16Yolo County, CACA224,410+7.7%−60%

17Stanislaus County, CACA557,719+7.5%−64%

18San Bernardino County, CACA2,224,091+7.2%−65%

19Tulare County, CACA485,146+7.0%−61%

20San Diego County, CACA3,282,248+6.6%−48%

21San Mateo County, CACA743,568+6.4%−28%

22Amador County, CACA41,876+6.3%−63%

23Orange County, CACA3,149,507+5.9%−68%

24Monterey County, CACA433,729+5.8%−55%

25Santa Barbara County, CACA442,065+5.7%−29%

26El Dorado County, CACA192,323+5.6%−77%

27Lake County, CACA67,772+5.4%−64%

28Sutter County, CACA98,787+5.2%−77%

29San Luis Obispo County, CACA282,367+4.7%−65%

30Mendocino County, CACA88,122+4.3%−42%

31Marin County, CACA253,694+3.9%−47%

32Tehama County, CACA64,665+3.7%−71%

33Madera County, CACA167,927+3.6%−91%

34Nevada County, CACA101,911+3.5%−80%

35Santa Cruz County, CACA258,852+3.2%−71%

36Imperial County, CACA181,411+3.0%−90%

37Glenn County, CACA28,141+2.8%−58%

38Shasta County, CACA181,648+2.8%−75%

39Inyo County, CACA18,158+2.5%−238%

40Ventura County, CACA830,851+2.5%−80%

41Alpine County, CACA1,043+2.5%−71%

42Los Angeles County, CACA9,694,934+2.0%−73%

43Colusa County, CACA21,836+2.0%−87%

44Humboldt County, CACA131,647+1.4%−78%

45Napa County, CACA132,949+1.1%−91%

46Sonoma County, CACA486,444+1.0%−94%

47Tuolumne County, CACA53,160+0.5%−96%

48Sierra County, CACA3,098-0.1%−102%

49Kings County, CACA154,327-0.3%−101%

50Calaveras County, CACA46,605-0.6%−102%

51Plumas County, CACA18,583-1.1%−120%

52Siskiyou County, CACA42,013-1.8%−204%

53Del Norte County, CACA26,410-3.0%−118%

54Butte County, CACA209,211-3.8%−133%

55Mariposa County, CACA16,918-6.1%−131%

56Lassen County, CACA28,117-6.2%−127%

57Mono County, CACA12,505-7.1%−124%

58Modoc County, CACA8,426-10.2%+330%

SHOWING 1–58 OF 58

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS