RANKING · 2025 ESTIMATES · 58 SHOWN OF 58

Fastest growing, California counties

California counties ranked by population growth from the 2020 census to 2025. 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

01Placer County, CACA442,081+9.2%−79%

02San Benito County, CACA70,082+9.1%−80%

03Yuba County, CACA88,691+8.7%+155%

04Madera County, CACA167,927+7.5%−81%

05San Joaquin County, CACA823,815+5.7%−67%

06Merced County, CACA297,260+5.7%−68%

07Riverside County, CACA2,544,916+5.2%−84%

08Yolo County, CACA224,410+3.7%−81%

09Amador County, CACA41,876+3.5%−79%

10Calaveras County, CACA46,605+2.9%−89%

11Fresno County, CACA1,035,456+2.7%−87%

12Tulare County, CACA485,146+2.5%−86%

13Sacramento County, CACA1,618,460+2.1%−88%

14Kern County, CACA927,068+2.0%−91%

15San Bernardino County, CACA2,224,091+1.9%−91%

16Kings County, CACA154,327+1.2%−96%

17Imperial County, CACA181,411+1.0%−97%

18Stanislaus County, CACA557,719+0.9%−96%

19El Dorado County, CACA192,323+0.6%−98%

20Solano County, CACA455,376+0.4%−97%

21Contra Costa County, CACA1,170,070+0.4%−98%

22Colusa County, CACA21,836-0.0%−100%

23San Luis Obispo County, CACA282,367-0.0%−100%

24Shasta County, CACA181,648-0.3%−103%

25Nevada County, CACA101,911-0.3%−102%

26Sonoma County, CACA486,444-0.5%−103%

27San Diego County, CACA3,282,248-0.5%−104%

28Lake County, CACA67,772-0.6%−104%

29Sutter County, CACA98,787-0.8%−104%

30Santa Clara County, CACA1,914,391-1.1%−109%

31Butte County, CACA209,211-1.1%−110%

32Orange County, CACA3,149,507-1.2%−107%

33Monterey County, CACA433,729-1.2%−109%

34Mariposa County, CACA16,918-1.2%−106%

35Santa Barbara County, CACA442,065-1.4%−117%

36Ventura County, CACA830,851-1.5%−112%

37Tehama County, CACA64,665-1.8%−114%

38Trinity County, CACA15,720-2.4%+675%

39Glenn County, CACA28,141-2.7%−140%

40Alameda County, CACA1,636,630-2.7%−121%

41San Mateo County, CACA743,568-2.7%−131%

42Modoc County, CACA8,426-3.1%+33%

43Los Angeles County, CACA9,694,934-3.2%−143%

44Marin County, CACA253,694-3.3%−144%

45Humboldt County, CACA131,647-3.5%−157%

46Napa County, CACA132,949-3.7%−130%

47Mendocino County, CACA88,122-3.8%−152%

48Sierra County, CACA3,098-4.3%−160%

49Tuolumne County, CACA53,160-4.4%−135%

50Santa Cruz County, CACA258,852-4.4%−139%

51Inyo County, CACA18,158-4.5%+145%

52Siskiyou County, CACA42,013-4.7%−365%

53Del Norte County, CACA26,410-4.8%−128%

54Mono County, CACA12,505-5.2%−118%

55San Francisco County, CACA826,079-5.5%−175%

56Plumas County, CACA18,583-6.1%−211%

57Alpine County, CACA1,043-13.4%−257%

58Lassen County, CACA28,117-14.1%−162%

SHOWING 1–58 OF 58

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES