RANKING · 2010 CENSUS · 58 SHOWN OF 58

Fastest growing, California counties · 2010

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

01Riverside County, CACA2,544,916+41.7%+30%

02Placer County, CACA442,081+40.3%−8%

03Kern County, CACA927,068+26.9%+24%

04Imperial County, CACA181,411+22.6%−25%

05Madera County, CACA167,927+22.5%−43%

06San Joaquin County, CACA823,815+21.6%+25%

07Merced County, CACA297,260+21.5%+19%

08Tulare County, CACA485,146+20.2%+12%

09Sutter County, CACA98,787+20.0%−11%

10Yuba County, CACA88,691+19.8%+480%

11Yolo County, CACA224,410+19.1%−2%

12San Bernardino County, CACA2,224,091+19.1%−7%

13Kings County, CACA154,327+18.2%−34%

14Fresno County, CACA1,035,456+16.4%−17%

15Sacramento County, CACA1,618,460+16.0%−9%

16El Dorado County, CACA192,323+15.8%−34%

17Stanislaus County, CACA557,719+15.1%−27%

18Colusa County, CACA21,836+13.9%−11%

19Tehama County, CACA64,665+13.2%+2%

20Calaveras County, CACA46,605+12.4%−54%

21Lake County, CACA67,772+10.9%−28%

22Contra Costa County, CACA1,170,070+10.6%−41%

23Mono County, CACA12,505+10.5%−64%

24San Diego County, CACA3,282,248+10.0%−21%

25Napa County, CACA132,949+9.8%−20%

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

27San Luis Obispo County, CACA282,367+9.3%−32%

28Shasta County, CACA181,648+8.6%−22%

29Amador County, CACA41,876+8.5%−49%

30Butte County, CACA209,211+8.3%−28%

31Nevada County, CACA101,911+7.3%−58%

32Mariposa County, CACA16,918+6.5%−67%

33Humboldt County, CACA131,647+6.4%+3%

34Glenn County, CACA28,141+6.3%−5%

35Santa Barbara County, CACA442,065+6.1%−24%

36Santa Clara County, CACA1,914,391+5.9%−52%

37Trinity County, CACA15,720+5.9%−1969%

38Orange County, CACA3,149,507+5.8%−68%

39Sonoma County, CACA486,444+5.5%−70%

40Solano County, CACA455,376+4.8%−70%

41Alameda County, CACA1,636,630+4.6%−64%

42Del Norte County, CACA26,410+4.0%−77%

43San Benito County, CACA70,082+3.8%−92%

44San Francisco County, CACA826,079+3.7%−50%

45Inyo County, CACA18,158+3.3%−282%

46Monterey County, CACA433,729+3.3%−74%

47Lassen County, CACA28,117+3.2%−86%

48Los Angeles County, CACA9,694,934+3.1%−58%

49Santa Cruz County, CACA258,852+2.7%−76%

50Modoc County, CACA8,426+2.5%−206%

51Marin County, CACA253,694+2.1%−72%

52Mendocino County, CACA88,122+1.8%−75%

53San Mateo County, CACA743,568+1.6%−82%

54Tuolumne County, CACA53,160+1.6%−87%

55Siskiyou County, CACA42,013+1.4%−24%

56Alpine County, CACA1,043-2.7%−132%

57Plumas County, CACA18,583-3.9%−171%

58Sierra County, CACA3,098-8.9%−224%

SHOWING 1–58 OF 58

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