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. The median across all 58 is -391. Biggest climber in the top 100 since 2020: Kings County, CA, up 34 places to #17.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Riverside County, CACA2,544,916+126,731−66%

02▲8San Joaquin County, CACA823,815+44,582−46%

03▲5San Bernardino County, CACA2,224,091+42,437−85%

04▲10Placer County, CACA442,081+37,342−51%

05▲1Sacramento County, CACA1,618,460+33,405−82%

06▲5Fresno County, CACA1,035,456+26,802−80%

07▲5Kern County, CACA927,068+17,833−85%

08▲11Merced County, CACA297,260+16,058−50%

09▲9Tulare County, CACA485,146+12,029−79%

10▲20Madera County, CACA167,927+11,672−67%

11▲12Yolo County, CACA224,410+8,007−71%

12▲15Yuba County, CACA88,691+7,116+257%

13▲15San Benito County, CACA70,082+5,873−64%

14▲3Stanislaus County, CACA557,719+4,841−94%

15▼6Contra Costa County, CACA1,170,070+4,143−97%

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

17▲34Kings County, CACA154,327+1,841−93%

18▲13Imperial County, CACA181,411+1,709−95%

19▲19Amador County, CACA41,876+1,402−72%

20▲30Calaveras County, CACA46,605+1,313−85%

21▲4El Dorado County, CACA192,323+1,138−96%

22▲23Colusa County, CACA21,836-3−100%

23▲1San Luis Obispo County, CACA282,367-57−100%

24▲24Sierra County, CACA3,098-138−158%

25▲22Alpine County, CACA1,043-161−269%

26▲30Mariposa County, CACA16,918-213−108%

27▲27Modoc County, CACA8,426-274+20%

28▲9Nevada County, CACA101,911-330−102%

29▲7Lake County, CACA67,772-391−105%

30▲10Trinity County, CACA15,720-392+856%

31▲2Shasta County, CACA181,648-507−103%

32▲23Mono County, CACA12,505-690−124%

33▲10Glenn County, CACA28,141-776−147%

34Sutter County, CACA98,787-846−106%

35▲9Inyo County, CACA18,158-858+155%

36▲3Tehama County, CACA64,665-1,164−118%

37▲12Plumas County, CACA18,583-1,207−211%

38▲15Del Norte County, CACA26,410-1,333−133%

39▲13Siskiyou County, CACA42,013-2,063−368%

40▼8Sonoma County, CACA486,444-2,419−103%

41▲17Butte County, CACA209,211-2,421−112%

42▲4Tuolumne County, CACA53,160-2,460−141%

43▼8Mendocino County, CACA88,122-3,479−159%

44▲13Lassen County, CACA28,117-4,613−174%

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

46▼4Napa County, CACA132,949-5,070−138%

47▼26Monterey County, CACA433,729-5,306−112%

48▼28Santa Barbara County, CACA442,065-6,164−121%

49▼23Marin County, CACA253,694-8,627−150%

50▼21Santa Cruz County, CACA258,852-12,009−146%

51▼29Ventura County, CACA830,851-12,992−115%

52▼50San Diego County, CACA3,282,248-16,386−105%

53▼38San Mateo County, CACA743,568-20,874−136%

54▼47Santa Clara County, CACA1,914,391-21,868−112%

55▼51Orange County, CACA3,149,507-37,482−109%

56▼51Alameda County, CACA1,636,630-45,723−128%

57▼44San Francisco County, CACA826,079-47,886−191%

58▼55Los Angeles County, CACA9,694,934-319,075−149%

SHOWING 1–58 OF 58

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES