RANKING · 2010 CENSUS · 58 SHOWN OF 58

Most population gained, California counties · 2010

California counties that added the most residents from the 2000 census to 2010, by raw count of people rather than percentage. 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 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Riverside County, CACA2,544,916+644,254+72%

02San Bernardino County, CACA2,224,091+325,776+12%

03Los Angeles County, CACA9,694,934+299,267−54%

04San Diego County, CACA3,282,248+281,480−11%

05Sacramento County, CACA1,618,460+195,289+7%

06Kern County, CACA927,068+177,986+51%

07Orange County, CACA3,149,507+163,943−62%

08Fresno County, CACA1,035,456+131,043−1%

09San Joaquin County, CACA823,815+121,708+47%

10Contra Costa County, CACA1,170,070+100,209−31%

11Placer County, CACA442,081+100,033+32%

12Santa Clara County, CACA1,914,391+99,057−46%

13Tulare County, CACA485,146+74,158+32%

14Ventura County, CACA830,851+70,121−17%

15Stanislaus County, CACA557,719+67,456−12%

16Alameda County, CACA1,636,630+66,530−60%

17Merced County, CACA297,260+45,239+41%

18Yolo County, CACA224,410+32,189+17%

19Imperial County, CACA181,411+32,167−3%

20San Francisco County, CACA826,079+28,502−46%

21Madera County, CACA167,927+27,756−21%

22Sonoma County, CACA486,444+25,264−64%

23El Dorado County, CACA192,323+24,759−18%

24Santa Barbara County, CACA442,065+24,548−17%

25Kings County, CACA154,327+23,521−16%

26San Luis Obispo County, CACA282,367+22,956−22%

27Solano County, CACA455,376+18,802−65%

28Butte County, CACA209,211+16,829−20%

29Sutter County, CACA98,787+15,807+9%

30Shasta County, CACA181,648+13,967−14%

31Monterey County, CACA433,729+13,295−71%

32Napa County, CACA132,949+12,205−10%

33Yuba County, CACA88,691+11,936+499%

34San Mateo County, CACA743,568+11,290−80%

35Humboldt County, CACA131,647+8,105+10%

36Tehama County, CACA64,665+7,424+16%

37Santa Cruz County, CACA258,852+6,780−74%

38Nevada County, CACA101,911+6,731−50%

39Lake County, CACA67,772+6,356−17%

40Marin County, CACA253,694+5,120−70%

41Calaveras County, CACA46,605+5,024−41%

42Amador County, CACA41,876+2,991−41%

43Colusa County, CACA21,836+2,615+3%

44San Benito County, CACA70,082+2,035−88%

45Glenn County, CACA28,141+1,669+1%

46Mendocino County, CACA88,122+1,576−73%

47Mono County, CACA12,505+1,349−53%

48Mariposa County, CACA16,918+1,121−60%

49Del Norte County, CACA26,410+1,103−73%

50Lassen County, CACA28,117+1,067−83%

51Tuolumne County, CACA53,160+864−86%

52Trinity County, CACA15,720+764−1963%

53Inyo County, CACA18,158+601−279%

54Siskiyou County, CACA42,013+599−22%

55Modoc County, CACA8,426+237−203%

56Alpine County, CACA1,043-33−135%

57Sierra County, CACA3,098-315−233%

58Plumas County, CACA18,583-817−175%

SHOWING 1–58 OF 58

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