RANKING · 2025 ESTIMATES · 58 SHOWN OF 58

Fastest shrinking, California counties

California counties with the steepest population decline from the 2020 census to 2025. This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is -0.8%. Biggest climber in the top 100 since 2020: San Francisco County, CA, up 42 places to #4.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01▲2Lassen County, CACA28,117-14.1%−36.7 pts

02▲16Alpine County, CACA1,043-13.4%−21.9 pts

03▲5Plumas County, CACA18,583-6.1%−11.6 pts

04▲42San Francisco County, CACA826,079-5.5%−12.8 pts

05▼3Mono County, CACA12,505-5.2%−34.3 pts

06Del Norte County, CACA26,410-4.8%−22.1 pts

07Siskiyou County, CACA42,013-4.7%−6.4 pts

08▲12Inyo County, CACA18,158-4.5%−2.7 pts

09▲15Santa Cruz County, CACA258,852-4.4%−15.7 pts

10▲2Tuolumne County, CACA53,160-4.4%−16.9 pts

11Sierra County, CACA3,098-4.3%−11.4 pts

12▲17Mendocino County, CACA88,122-3.8%−11.2 pts

13▲1Napa County, CACA132,949-3.7%−15.9 pts

14▲1Humboldt County, CACA131,647-3.5%−9.7 pts

15▲13Marin County, CACA253,694-3.3%−10.8 pts

16▲1Los Angeles County, CACA9,694,934-3.2%−10.6 pts

17▼16Modoc County, CACA8,426-3.1%−0.8 pts

18▲20San Mateo County, CACA743,568-2.7%−11.6 pts

19▲33Alameda County, CACA1,636,630-2.7%−15.6 pts

20▲2Glenn County, CACA28,141-2.7%−9.4 pts

21▲37Trinity County, CACA15,720-2.4%−2.1 pts

22▲5Tehama County, CACA64,665-1.8%−14.7 pts

23▼4Ventura County, CACA830,851-1.5%−14.1 pts

24▲10Santa Barbara County, CACA442,065-1.4%−9.4 pts

25▼21Mariposa County, CACA16,918-1.2%−21.0 pts

26▲9Monterey County, CACA433,729-1.2%−14.2 pts

27▲9Orange County, CACA3,149,507-1.2%−19.3 pts

28▼23Butte County, CACA209,211-1.1%−12.7 pts

29▲18Santa Clara County, CACA1,914,391-1.1%−13.5 pts

30▲1Sutter County, CACA98,787-0.8%−23.4 pts

31▲1Lake County, CACA67,772-0.6%−15.7 pts

32▲7San Diego County, CACA3,282,248-0.5%−13.1 pts

33▼20Sonoma County, CACA486,444-0.5%−18.6 pts

34▼9Nevada County, CACA101,911-0.3%−17.5 pts

35▼14Shasta County, CACA181,648-0.3%−11.3 pts

36▼6San Luis Obispo County, CACA282,367-0.0%−13.6 pts

37▼21Colusa County, CACA21,836-0.0%−15.6 pts

38▲13Contra Costa County, CACA1,170,070+0.4%−17.7 pts

39▲9Solano County, CACA455,376+0.4%−15.5 pts

40▼7El Dorado County, CACA192,323+0.6%−23.5 pts

41▲1Stanislaus County, CACA557,719+0.9%−19.8 pts

42▼19Imperial County, CACA181,411+1.0%−29.3 pts

43▼33Kings County, CACA154,327+1.2%−26.4 pts

44▼3San Bernardino County, CACA2,224,091+1.9%−18.6 pts

45▼1Kern County, CACA927,068+2.0%−19.8 pts

46▲7Sacramento County, CACA1,618,460+2.1%−15.4 pts

47▼7Tulare County, CACA485,146+2.5%−15.4 pts

48▼3Fresno County, CACA1,035,456+2.7%−17.1 pts

49▼40Calaveras County, CACA46,605+2.9%−23.8 pts

50▼13Amador County, CACA41,876+3.5%−13.4 pts

51▼8Yolo County, CACA224,410+3.7%−15.8 pts

52▼2Riverside County, CACA2,544,916+5.2%−26.8 pts

53▼4Merced County, CACA297,260+5.7%−12.3 pts

54▲1San Joaquin County, CACA823,815+5.7%−11.5 pts

55▼29Madera County, CACA167,927+7.5%−32.3 pts

56▼2Yuba County, CACA88,691+8.7%+5.3 pts

57San Benito County, CACA70,082+9.1%−35.9 pts

58▼2Placer County, CACA442,081+9.2%−34.5 pts

SHOWING 1–58 OF 58

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