RANKING · 2024 ACS · 58 SHOWN OF 58

Largest foreign-born population, California counties

California counties with the most residents born outside the United States, as of the 2024 American Community Survey. Ranked by number of people, not share. This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 29,926. Biggest climber in the top 100 since 2020: Calaveras County, CA, up 5 places to #45.

CaliforniaAll states All rankings

SAME RANKING BYCities States Metros

YEAR2010 2020 2024

RANKPLACESTATEPOPFOREIGN-BORN POPULATIONVS 2010

01Los Angeles County, CACA9,694,9343,279,695−6%

02Orange County, CACA3,149,507961,832+5%

03Santa Clara County, CACA1,914,391789,756+20%

04San Diego County, CACA3,282,248749,735+5%

05Alameda County, CACA1,636,630572,911+23%

06Riverside County, CACA2,544,916543,865+11%

07San Bernardino County, CACA2,224,091474,713+8%

08Sacramento County, CACA1,618,460354,878+27%

09▲1Contra Costa County, CACA1,170,070309,611+25%

10▼1San Francisco County, CACA826,079282,674−1%

11San Mateo County, CACA743,568265,258+9%

12Fresno County, CACA1,035,456203,377+1%

13▲2San Joaquin County, CACA823,815200,943+26%

14Ventura County, CACA830,851186,177−1%

15▼2Kern County, CACA927,068185,151+7%

16Monterey County, CACA433,729129,418+3%

17Stanislaus County, CACA557,719116,294+11%

18Tulare County, CACA485,146106,332+4%

19Santa Barbara County, CACA442,06598,422−2%

20Solano County, CACA455,37693,940+14%

21Sonoma County, CACA486,44481,688+2%

22Merced County, CACA297,26074,255+17%

23Imperial County, CACA181,41156,995+2%

24▲3Placer County, CACA442,08153,126+51%

25Marin County, CACA253,69450,611+6%

26Santa Cruz County, CACA258,85247,705−1%

27▼3Yolo County, CACA224,41046,242+13%

28Madera County, CACA167,92732,391+4%

29▲1Napa County, CACA132,94929,926−3%

30▼1Kings County, CACA154,32729,420−11%

31San Luis Obispo County, CACA282,36727,780+3%

32Sutter County, CACA98,78722,484+6%

33▲1Butte County, CACA209,21117,789+2%

34▼1El Dorado County, CACA192,32317,749+25%

35San Benito County, CACA70,08213,488+15%

36Mendocino County, CACA88,12210,983+8%

37▲1Yuba County, CACA88,6919,718+3%

38▼1Shasta County, CACA181,6489,142+1%

39Humboldt County, CACA131,6478,284+14%

40▲2Tehama County, CACA64,6657,249+6%

41▲2Lake County, CACA67,7726,733+17%

42▼1Nevada County, CACA101,9116,536+20%

43▼3Colusa County, CACA21,8366,053+12%

44Glenn County, CACA28,1415,299+20%

45▲5Calaveras County, CACA46,6052,841+54%

46Siskiyou County, CACA42,0132,539−3%

47▼2Tuolumne County, CACA53,1602,508+15%

48▼1Amador County, CACA41,8762,415+4%

49▲2Lassen County, CACA28,1172,125−15%

50▼1Mono County, CACA12,5051,855−29%

51▼3Del Norte County, CACA26,4101,851−11%

52Inyo County, CACA18,1581,483−22%

53Mariposa County, CACA16,9181,409+106%

54Plumas County, CACA18,583937−18%

55▲1Trinity County, CACA15,720763+78%

56▼1Modoc County, CACA8,426757+18%

57▲1Sierra County, CACA3,098103−39%

58▼1Alpine County, CACA1,04387+47%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES