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%+17.2 pts

02San Benito County, CACA70,082+16.2%−28.9 pts

03Placer County, CACA442,081+16.2%−27.6 pts

04San Joaquin County, CACA823,815+13.7%−3.6 pts

05Yuba County, CACA88,691+13.1%+9.6 pts

06Sacramento County, CACA1,618,460+11.7%−5.8 pts

07Alameda County, CACA1,636,630+11.4%−1.5 pts

08Contra Costa County, CACA1,170,070+11.1%−6.9 pts

09Riverside County, CACA2,544,916+10.4%−21.6 pts

10Merced County, CACA297,260+9.9%−8.1 pts

11Solano County, CACA455,376+9.7%−6.2 pts

12Santa Clara County, CACA1,914,391+8.7%−3.7 pts

13San Francisco County, CACA826,079+8.5%+1.2 pts

14Fresno County, CACA1,035,456+8.4%−11.4 pts

15Kern County, CACA927,068+8.3%−13.5 pts

16Yolo County, CACA224,410+7.7%−11.8 pts

17Stanislaus County, CACA557,719+7.5%−13.2 pts

18San Bernardino County, CACA2,224,091+7.2%−13.3 pts

19Tulare County, CACA485,146+7.0%−11.0 pts

20San Diego County, CACA3,282,248+6.6%−6.1 pts

21San Mateo County, CACA743,568+6.4%−2.5 pts

22Amador County, CACA41,876+6.3%−10.6 pts

23Orange County, CACA3,149,507+5.9%−12.2 pts

24Monterey County, CACA433,729+5.8%−7.2 pts

25Santa Barbara County, CACA442,065+5.7%−2.3 pts

26El Dorado County, CACA192,323+5.6%−18.5 pts

27Lake County, CACA67,772+5.4%−9.8 pts

28Sutter County, CACA98,787+5.2%−17.4 pts

29San Luis Obispo County, CACA282,367+4.7%−8.9 pts

30Mendocino County, CACA88,122+4.3%−3.1 pts

31Marin County, CACA253,694+3.9%−3.5 pts

32Tehama County, CACA64,665+3.7%−9.2 pts

33Madera County, CACA167,927+3.6%−36.2 pts

34Nevada County, CACA101,911+3.5%−13.7 pts

35Santa Cruz County, CACA258,852+3.2%−8.0 pts

36Imperial County, CACA181,411+3.0%−27.3 pts

37Glenn County, CACA28,141+2.8%−3.8 pts

38Shasta County, CACA181,648+2.8%−8.2 pts

39Inyo County, CACA18,158+2.5%+4.4 pts

40Ventura County, CACA830,851+2.5%−10.1 pts

41Alpine County, CACA1,043+2.5%−6.1 pts

42Los Angeles County, CACA9,694,934+2.0%−5.4 pts

43Colusa County, CACA21,836+2.0%−13.6 pts

44Humboldt County, CACA131,647+1.4%−4.8 pts

45Napa County, CACA132,949+1.1%−11.1 pts

46Sonoma County, CACA486,444+1.0%−17.1 pts

47Tuolumne County, CACA53,160+0.5%−12.0 pts

48Sierra County, CACA3,098-0.1%−7.3 pts

49Kings County, CACA154,327-0.3%−27.9 pts

50Calaveras County, CACA46,605-0.6%−27.4 pts

51Plumas County, CACA18,583-1.1%−6.6 pts

52Siskiyou County, CACA42,013-1.8%−3.6 pts

53Del Norte County, CACA26,410-3.0%−20.3 pts

54Butte County, CACA209,211-3.8%−15.4 pts

55Mariposa County, CACA16,918-6.1%−25.9 pts

56Lassen County, CACA28,117-6.2%−28.8 pts

57Mono County, CACA12,505-7.1%−36.2 pts

58Modoc County, CACA8,426-10.2%−7.8 pts

SHOWING 1–58 OF 58

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