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RANKING · 2024 ACS · 58 SHOWN OF 58

Most foreign-born residents, California counties

California counties ranked by the share of residents born outside the US (2024 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 19.6%. Biggest climber in the top 100 since 2020: Mariposa County, CA, up 7 places to #44.

Most foreign-born residents by state
All USAlaskaAlabamaArkansasArizonaCaliforniaColoradoFloridaGeorgiaIowaIdahoIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMaineMichiganMinnesotaMissouriMississippiMontanaNorth CarolinaNorth DakotaNebraskaNew HampshireNew JerseyNew MexicoNevadaNew YorkOhioOklahomaOregonPennsylvaniaSouth CarolinaSouth DakotaTennesseeTexasUtahVirginiaVermontWashingtonWisconsinWest VirginiaWyoming
RANKPLACESTATEPOPFOREIGN-BORNVS 2010
01Santa Clara County, CACA1,914,39141.5%+4.5 pts
02San Mateo County, CACA743,56835.7%+1.8 pts
03▲2Alameda County, CACA1,636,63034.7%+3.9 pts
04▼1San Francisco County, CACA826,07934.0%−1.6 pts
05▼1Los Angeles County, CACA9,694,93433.4%−2.2 pts
06Imperial County, CACA181,41131.6%−0.3 pts
07Orange County, CACA3,149,50730.4%−0.1 pts
08Monterey County, CACA433,72929.6%−0.6 pts
09Colusa County, CACA21,83627.5%+2.3 pts
10▲1Contra Costa County, CACA1,170,07026.6%+3.0 pts
11▼1Merced County, CACA297,26025.6%+0.8 pts
12San Joaquin County, CACA823,81525.2%+1.9 pts
13San Diego County, CACA3,282,24822.8%−0.3 pts
14▲2Sutter County, CACA98,78722.7%+0.5 pts
15▲6Sacramento County, CACA1,618,46022.3%+2.6 pts
16▲3Ventura County, CACA830,85122.2%−0.6 pts
17Tulare County, CACA485,14622.2%−0.9 pts
18▲2Napa County, CACA132,94922.2%−0.3 pts
19▼5Santa Barbara County, CACA442,06522.2%−1.6 pts
20▼2Riverside County, CACA2,544,91621.9%−0.4 pts
21▲1San Bernardino County, CACA2,224,09121.6%0.0 pts
22▲3Stanislaus County, CACA557,71921.0%+0.6 pts
23▼8Yolo County, CACA224,41021.0%+0.5 pts
24▲3Solano County, CACA455,37620.8%+0.9 pts
25▲1Kern County, CACA927,06820.2%−0.3 pts
26▼3Madera County, CACA167,92720.1%−0.4 pts
27▲2San Benito County, CACA70,08220.0%−1.2 pts
28▼4Fresno County, CACA1,035,45620.0%−1.7 pts
29▲1Marin County, CACA253,69419.6%+0.8 pts
30▼2Kings County, CACA154,32719.2%−2.3 pts
31Glenn County, CACA28,14118.6%+2.9 pts
32Santa Cruz County, CACA258,85218.0%−0.4 pts
33Sonoma County, CACA486,44416.8%+0.3 pts
34Mono County, CACA12,50514.1%−4.3 pts
35▲2Placer County, CACA442,08112.7%+2.6 pts
36▼1Mendocino County, CACA88,12212.2%+0.6 pts
37▼1Yuba County, CACA88,69111.5%−1.6 pts
38▲2Tehama County, CACA64,66511.1%+0.3 pts
39▲2Lake County, CACA67,7729.9%+1.0 pts
40▼2San Luis Obispo County, CACA282,3679.9%−0.1 pts
41▼2El Dorado County, CACA192,3239.2%+1.4 pts
42▲1Modoc County, CACA8,4268.8%+2.2 pts
43▲1Butte County, CACA209,2118.6%+0.6 pts
44▲7Mariposa County, CACA16,9188.2%+4.5 pts
45Inyo County, CACA18,1587.9%−2.3 pts
46▲7Lassen County, CACA28,1177.0%−0.2 pts
47▼5Del Norte County, CACA26,4106.8%−0.4 pts
48▲1Nevada County, CACA101,9116.4%+0.9 pts
49▲3Humboldt County, CACA131,6476.2%+0.8 pts
50▲5Calaveras County, CACA46,6056.1%+2.1 pts
51▼4Siskiyou County, CACA42,0135.8%0.0 pts
52▼4Amador County, CACA41,8765.8%−0.2 pts
53▼7Alpine County, CACA1,0435.4%+0.4 pts
54▼4Shasta County, CACA181,6485.0%−0.1 pts
55▲1Plumas County, CACA18,5834.8%−0.9 pts
56▲1Trinity County, CACA15,7204.8%+1.7 pts
57▼3Tuolumne County, CACA53,1604.6%+0.7 pts
58Sierra County, CACA3,0983.8%−1.5 pts
SHOWING 1–58 OF 58

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