RANKING · 2000 CENSUS · 58 SHOWN OF 58

Most population gained, California counties · 2000

California counties that added the most residents from the 1990 census to 2000, by raw count of people rather than percentage. This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is +27,568.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01Los Angeles County, CACA9,694,934+656,174–

02Orange County, CACA3,149,507+435,733–

03Riverside County, CACA2,544,916+374,974–

04San Diego County, CACA3,282,248+315,817–

05San Bernardino County, CACA2,224,091+291,054–

06Santa Clara County, CACA1,914,391+185,008–

07Sacramento County, CACA1,618,460+182,280–

08Alameda County, CACA1,636,630+164,559–

09Contra Costa County, CACA1,170,070+145,084–

10Fresno County, CACA1,035,456+131,917–

11Kern County, CACA927,068+118,168–

12Ventura County, CACA830,851+84,181–

13San Joaquin County, CACA823,815+82,970–

14Stanislaus County, CACA557,719+76,475–

15Placer County, CACA442,081+75,603–

16Sonoma County, CACA486,444+70,392–

17San Mateo County, CACA743,568+57,538–

18Tulare County, CACA485,146+56,100–

19Solano County, CACA455,376+54,121–

20San Francisco County, CACA826,079+52,774–

21Monterey County, CACA433,729+46,102–

22Madera County, CACA167,927+35,019–

23Imperial County, CACA181,411+33,058–

24Merced County, CACA297,260+32,151–

25El Dorado County, CACA192,323+30,304–

26Santa Barbara County, CACA442,065+29,739–

27San Luis Obispo County, CACA282,367+29,519–

28Kings County, CACA154,327+27,992–

29Yolo County, CACA224,410+27,568–

30Santa Cruz County, CACA258,852+25,868–

31Butte County, CACA209,211+21,051–

32Marin County, CACA253,694+17,193–

33San Benito County, CACA70,082+16,537–

34Shasta County, CACA181,648+16,220–

35Sutter County, CACA98,787+14,515–

36Nevada County, CACA101,911+13,523–

37Napa County, CACA132,949+13,514–

38Calaveras County, CACA46,605+8,556–

39Lake County, CACA67,772+7,678–

40Humboldt County, CACA131,647+7,400–

41Tehama County, CACA64,665+6,414–

42Lassen County, CACA28,117+6,230–

43Tuolumne County, CACA53,160+6,045–

44Mendocino County, CACA88,122+5,920–

45Amador County, CACA41,876+5,061–

46Del Norte County, CACA26,410+4,047–

47Mono County, CACA12,505+2,897–

48Mariposa County, CACA16,918+2,828–

49Colusa County, CACA21,836+2,529–

50Yuba County, CACA88,691+1,991–

51Glenn County, CACA28,141+1,655–

52Plumas County, CACA18,583+1,085–

53Siskiyou County, CACA42,013+770–

54Sierra County, CACA3,098+237–

55Alpine County, CACA1,043+95–

56Trinity County, CACA15,720-41–

57Modoc County, CACA8,426-229–

58Inyo County, CACA18,158-336–

SHOWING 1–58 OF 58

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS