RANKING · 2010 CENSUS · 58 SHOWN OF 58

Most population lost, California counties · 2010

California counties that lost the most residents from the 2000 census to 2010, by raw count of people rather than percentage. This list covers the 58 counties in California that qualify, ranked against each other statewide.

Flip the list · Most population gained, US counties →

CaliforniaAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Plumas County, CACA18,583-817−175%

02Sierra County, CACA3,098-315−233%

03Alpine County, CACA1,043-33−135%

04Modoc County, CACA8,426+237−203%

05Siskiyou County, CACA42,013+599−22%

06Inyo County, CACA18,158+601−279%

07Trinity County, CACA15,720+764−1963%

08Tuolumne County, CACA53,160+864−86%

09Lassen County, CACA28,117+1,067−83%

10Del Norte County, CACA26,410+1,103−73%

11Mariposa County, CACA16,918+1,121−60%

12Mono County, CACA12,505+1,349−53%

13Mendocino County, CACA88,122+1,576−73%

14Glenn County, CACA28,141+1,669+1%

15San Benito County, CACA70,082+2,035−88%

16Colusa County, CACA21,836+2,615+3%

17Amador County, CACA41,876+2,991−41%

18Calaveras County, CACA46,605+5,024−41%

19Marin County, CACA253,694+5,120−70%

20Lake County, CACA67,772+6,356−17%

21Nevada County, CACA101,911+6,731−50%

22Santa Cruz County, CACA258,852+6,780−74%

23Tehama County, CACA64,665+7,424+16%

24Humboldt County, CACA131,647+8,105+10%

25San Mateo County, CACA743,568+11,290−80%

26Yuba County, CACA88,691+11,936+499%

27Napa County, CACA132,949+12,205−10%

28Monterey County, CACA433,729+13,295−71%

29Shasta County, CACA181,648+13,967−14%

30Sutter County, CACA98,787+15,807+9%

31Butte County, CACA209,211+16,829−20%

32Solano County, CACA455,376+18,802−65%

33San Luis Obispo County, CACA282,367+22,956−22%

34Kings County, CACA154,327+23,521−16%

35Santa Barbara County, CACA442,065+24,548−17%

36El Dorado County, CACA192,323+24,759−18%

37Sonoma County, CACA486,444+25,264−64%

38Madera County, CACA167,927+27,756−21%

39San Francisco County, CACA826,079+28,502−46%

40Imperial County, CACA181,411+32,167−3%

41Yolo County, CACA224,410+32,189+17%

42Merced County, CACA297,260+45,239+41%

43Alameda County, CACA1,636,630+66,530−60%

44Stanislaus County, CACA557,719+67,456−12%

45Ventura County, CACA830,851+70,121−17%

46Tulare County, CACA485,146+74,158+32%

47Santa Clara County, CACA1,914,391+99,057−46%

48Placer County, CACA442,081+100,033+32%

49Contra Costa County, CACA1,170,070+100,209−31%

50San Joaquin County, CACA823,815+121,708+47%

51Fresno County, CACA1,035,456+131,043−1%

52Orange County, CACA3,149,507+163,943−62%

53Kern County, CACA927,068+177,986+51%

54Sacramento County, CACA1,618,460+195,289+7%

55San Diego County, CACA3,282,248+281,480−11%

56Los Angeles County, CACA9,694,934+299,267−54%

57San Bernardino County, CACA2,224,091+325,776+12%

58Riverside County, CACA2,544,916+644,254+72%

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS