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RANKING · 2020 CENSUS · 58 SHOWN OF 58

Highest Irish population share, California counties · 2020

California counties ranked by the share of all residents who are Irish ancestry (2020 American Community Survey). A concentration measure: Irish residents as a percentage of total population. This list covers the 58 counties in California that qualify, ranked against each other statewide.

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RELATEDLargest American populationHighest American population shareLargest Arab populationHighest Arab population shareLargest Egyptian populationHighest Egyptian population share
YEAR201020202024
Highest Irish population share by state
All USAlaskaAlabamaArkansasArizonaCaliforniaColoradoFloridaGeorgiaIowaIdahoIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMaineMichiganMinnesotaMissouriMississippiMontanaNorth CarolinaNorth DakotaNebraskaNew HampshireNew JerseyNew MexicoNevadaNew YorkOhioOklahomaOregonPennsylvaniaSouth CarolinaSouth DakotaTennesseeTexasUtahVirginiaVermontWashingtonWisconsinWest VirginiaWyoming
RANKPLACESTATEPOPIRISH SHAREVS 2010
01Mariposa County, CACA16,91817.0%−4.9 pts
02Calaveras County, CACA46,60516.0%−1.0 pts
03Tuolumne County, CACA53,16015.5%−0.6 pts
04Amador County, CACA41,87613.7%−4.9 pts
05Mono County, CACA12,50513.0%+0.1 pts
06Modoc County, CACA8,42612.8%−5.2 pts
07Marin County, CACA253,69412.5%−2.5 pts
08Sonoma County, CACA486,44412.4%−1.3 pts
09San Luis Obispo County, CACA282,36712.1%−0.3 pts
10Nevada County, CACA101,91111.9%−6.3 pts
11Siskiyou County, CACA42,01311.8%−3.2 pts
12Sierra County, CACA3,09811.5%−1.2 pts
13Shasta County, CACA181,64811.3%−4.2 pts
14Humboldt County, CACA131,64711.2%−2.2 pts
15Trinity County, CACA15,72011.1%−11.8 pts
16Tehama County, CACA64,66511.0%−3.9 pts
17El Dorado County, CACA192,32310.9%−3.9 pts
18Placer County, CACA442,08110.8%−4.9 pts
19Mendocino County, CACA88,12210.5%−2.8 pts
20Santa Cruz County, CACA258,85210.3%−1.3 pts
21Butte County, CACA209,21110.3%−3.9 pts
22Lake County, CACA67,77210.3%−7.8 pts
23Alpine County, CACA1,04310.1%−4.4 pts
24Plumas County, CACA18,5839.7%−5.7 pts
25Sutter County, CACA98,7879.7%−0.0 pts
26Yuba County, CACA88,6919.3%−2.1 pts
27Del Norte County, CACA26,4109.2%−6.1 pts
28Inyo County, CACA18,1589.1%−5.2 pts
29Lassen County, CACA28,1179.0%−5.4 pts
30Napa County, CACA132,9498.4%−2.3 pts
31Contra Costa County, CACA1,170,0707.9%−1.8 pts
32Colusa County, CACA21,8367.9%+0.4 pts
33Yolo County, CACA224,4107.7%−1.7 pts
34Ventura County, CACA830,8517.7%−1.7 pts
35San Francisco County, CACA826,0797.7%−0.5 pts
36Santa Barbara County, CACA442,0657.5%−1.8 pts
37San Diego County, CACA3,282,2487.4%−1.9 pts
38San Mateo County, CACA743,5687.1%−1.5 pts
39Sacramento County, CACA1,618,4607.1%−2.5 pts
40San Benito County, CACA70,0827.0%−1.5 pts
41Solano County, CACA455,3766.6%−1.7 pts
42Orange County, CACA3,149,5076.4%−2.1 pts
43Glenn County, CACA28,1416.2%−3.0 pts
44Madera County, CACA167,9276.2%−0.8 pts
45Stanislaus County, CACA557,7196.2%−2.7 pts
46Riverside County, CACA2,544,9165.6%−2.0 pts
47Alameda County, CACA1,636,6305.6%−0.9 pts
48San Joaquin County, CACA823,8155.6%−1.3 pts
49San Bernardino County, CACA2,224,0915.2%−1.7 pts
50Kern County, CACA927,0684.8%−3.0 pts
51Fresno County, CACA1,035,4564.8%−1.1 pts
52Santa Clara County, CACA1,914,3914.7%−1.3 pts
53Monterey County, CACA433,7294.5%−2.3 pts
54Merced County, CACA297,2604.0%−1.1 pts
55Kings County, CACA154,3274.0%−2.7 pts
56Tulare County, CACA485,1463.8%−1.1 pts
57Los Angeles County, CACA9,694,9343.6%−0.7 pts
58Imperial County, CACA181,4111.8%−0.9 pts
SHOWING 1–58 OF 58
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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS