RANKING · 2000 CENSUS · 58 SHOWN OF 58

Fastest growing, California counties · 2000

California counties ranked by population growth 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

RELATEDLargest by population Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01San Benito County, CACA70,082+45.1%+0%

02Placer County, CACA442,081+43.8%+0%

03Madera County, CACA167,927+39.8%+0%

04Riverside County, CACA2,544,916+32.0%+0%

05Imperial County, CACA181,411+30.2%+0%

06Mono County, CACA12,505+29.1%+0%

07Kings County, CACA154,327+27.6%+0%

08Calaveras County, CACA46,605+26.7%+0%

09El Dorado County, CACA192,323+24.1%+0%

10Lassen County, CACA28,117+22.6%+0%

11Sutter County, CACA98,787+22.5%+0%

12Kern County, CACA927,068+21.7%+0%

13Stanislaus County, CACA557,719+20.6%+0%

14San Bernardino County, CACA2,224,091+20.5%+0%

15Mariposa County, CACA16,918+19.8%+0%

16Fresno County, CACA1,035,456+19.8%+0%

17Yolo County, CACA224,410+19.5%+0%

18Sonoma County, CACA486,444+18.1%+0%

19Orange County, CACA3,149,507+18.1%+0%

20Contra Costa County, CACA1,170,070+18.1%+0%

21Merced County, CACA297,260+18.0%+0%

22Tulare County, CACA485,146+18.0%+0%

23Sacramento County, CACA1,618,460+17.5%+0%

24San Joaquin County, CACA823,815+17.3%+0%

25Del Norte County, CACA26,410+17.3%+0%

26Nevada County, CACA101,911+17.2%+0%

27Amador County, CACA41,876+16.8%+0%

28Solano County, CACA455,376+15.9%+0%

29Colusa County, CACA21,836+15.5%+0%

30Lake County, CACA67,772+15.2%+0%

31San Luis Obispo County, CACA282,367+13.6%+0%

32Monterey County, CACA433,729+13.0%+0%

33Tehama County, CACA64,665+12.9%+0%

34Alameda County, CACA1,636,630+12.9%+0%

35San Diego County, CACA3,282,248+12.6%+0%

36Ventura County, CACA830,851+12.6%+0%

37Tuolumne County, CACA53,160+12.5%+0%

38Santa Clara County, CACA1,914,391+12.4%+0%

39Napa County, CACA132,949+12.2%+0%

40Butte County, CACA209,211+11.6%+0%

41Santa Cruz County, CACA258,852+11.3%+0%

42Shasta County, CACA181,648+11.0%+0%

43San Mateo County, CACA743,568+8.9%+0%

44Alpine County, CACA1,043+8.5%+0%

45Santa Barbara County, CACA442,065+8.0%+0%

46Marin County, CACA253,694+7.5%+0%

47Los Angeles County, CACA9,694,934+7.4%+0%

48Mendocino County, CACA88,122+7.4%+0%

49San Francisco County, CACA826,079+7.3%+0%

50Sierra County, CACA3,098+7.1%+0%

51Glenn County, CACA28,141+6.7%+0%

52Humboldt County, CACA131,647+6.2%+0%

53Plumas County, CACA18,583+5.5%+0%

54Yuba County, CACA88,691+3.4%+0%

55Siskiyou County, CACA42,013+1.8%+0%

56Trinity County, CACA15,720-0.3%+0%

57Inyo County, CACA18,158-1.8%+0%

58Modoc County, CACA8,426-2.4%+0%

SHOWING 1–58 OF 58

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