RANKING · 2025 ESTIMATES · 58 SHOWN OF 58

Most population gained, California counties

California counties that added the most residents from the 2020 census to 2025, 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+126,731−66%

02San Joaquin County, CACA823,815+44,582−46%

03San Bernardino County, CACA2,224,091+42,437−85%

04Placer County, CACA442,081+37,342−51%

05Sacramento County, CACA1,618,460+33,405−82%

06Fresno County, CACA1,035,456+26,802−80%

07Kern County, CACA927,068+17,833−85%

08Merced County, CACA297,260+16,058−50%

09Tulare County, CACA485,146+12,029−79%

10Madera County, CACA167,927+11,672−67%

11Yolo County, CACA224,410+8,007−71%

12Yuba County, CACA88,691+7,116+257%

13San Benito County, CACA70,082+5,873−64%

14Stanislaus County, CACA557,719+4,841−94%

15Contra Costa County, CACA1,170,070+4,143−97%

16Solano County, CACA455,376+1,885−97%

17Kings County, CACA154,327+1,841−93%

18Imperial County, CACA181,411+1,709−95%

19Amador County, CACA41,876+1,402−72%

20Calaveras County, CACA46,605+1,313−85%

21El Dorado County, CACA192,323+1,138−96%

22Colusa County, CACA21,836-3−100%

23San Luis Obispo County, CACA282,367-57−100%

24Sierra County, CACA3,098-138−158%

25Alpine County, CACA1,043-161−269%

26Mariposa County, CACA16,918-213−108%

27Modoc County, CACA8,426-274+20%

28Nevada County, CACA101,911-330−102%

29Lake County, CACA67,772-391−105%

30Trinity County, CACA15,720-392+856%

31Shasta County, CACA181,648-507−103%

32Mono County, CACA12,505-690−124%

33Glenn County, CACA28,141-776−147%

34Sutter County, CACA98,787-846−106%

35Inyo County, CACA18,158-858+155%

36Tehama County, CACA64,665-1,164−118%

37Plumas County, CACA18,583-1,207−211%

38Del Norte County, CACA26,410-1,333−133%

39Siskiyou County, CACA42,013-2,063−368%

40Sonoma County, CACA486,444-2,419−103%

41Butte County, CACA209,211-2,421−112%

42Tuolumne County, CACA53,160-2,460−141%

43Mendocino County, CACA88,122-3,479−159%

44Lassen County, CACA28,117-4,613−174%

45Humboldt County, CACA131,647-4,816−165%

46Napa County, CACA132,949-5,070−138%

47Monterey County, CACA433,729-5,306−112%

48Santa Barbara County, CACA442,065-6,164−121%

49Marin County, CACA253,694-8,627−150%

50Santa Cruz County, CACA258,852-12,009−146%

51Ventura County, CACA830,851-12,992−115%

52San Diego County, CACA3,282,248-16,386−105%

53San Mateo County, CACA743,568-20,874−136%

54Santa Clara County, CACA1,914,391-21,868−112%

55Orange County, CACA3,149,507-37,482−109%

56Alameda County, CACA1,636,630-45,723−128%

57San Francisco County, CACA826,079-47,886−191%

58Los Angeles County, CACA9,694,934-319,075−149%

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