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RANKING · 2024 ACS · 58 SHOWN OF 58

Highest Irish population share, California counties

California counties ranked by the share of all residents who are Irish ancestry (2024 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. The median across all 58 is 7.8%. Biggest climber in the top 100 since 2020: Lake County, CA, up 17 places to #5.

Irish Americans: full group profile →
SAME RANKING BYCitiesStatesMetros
Highest Irish population share by state
All USAlaskaAlabamaArkansasArizonaCaliforniaColoradoFloridaGeorgiaIowaIdahoIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMaineMichiganMinnesotaMissouriMississippiMontanaNorth CarolinaNorth DakotaNebraskaNew HampshireNew JerseyNew MexicoNevadaNew YorkOhioOklahomaOregonPennsylvaniaSouth CarolinaSouth DakotaTennesseeTexasUtahVirginiaVermontWashingtonWisconsinWest VirginiaWyoming
RANKPLACESTATEPOPIRISH SHAREVS 2010
01Mariposa County, CACA16,91817.6%−4.3 pts
02Calaveras County, CACA46,60517.2%+0.2 pts
03Tuolumne County, CACA53,16016.2%+0.1 pts
04Amador County, CACA41,87614.6%−4.0 pts
05▲17Lake County, CACA67,77214.0%−4.0 pts
06▲4Nevada County, CACA101,91113.5%−4.7 pts
07Marin County, CACA253,69413.2%−1.8 pts
08▲9El Dorado County, CACA192,32312.8%−2.0 pts
09San Luis Obispo County, CACA282,36712.7%+0.3 pts
10▲1Siskiyou County, CACA42,01312.5%−2.5 pts
11▼3Sonoma County, CACA486,44412.2%−1.5 pts
12Sierra County, CACA3,09812.0%−0.7 pts
13▲1Humboldt County, CACA131,64711.8%−1.6 pts
14▲7Butte County, CACA209,21111.4%−2.8 pts
15▼2Shasta County, CACA181,64811.4%−4.1 pts
16▲7Alpine County, CACA1,04311.3%−3.3 pts
17▼12Mono County, CACA12,50511.2%−1.6 pts
18Placer County, CACA442,08111.0%−4.6 pts
19▲8Del Norte County, CACA26,41010.8%−4.5 pts
20▼4Tehama County, CACA64,66510.8%−4.1 pts
21▼15Modoc County, CACA8,42610.7%−7.2 pts
22▼2Santa Cruz County, CACA258,85210.5%−1.2 pts
23▲1Plumas County, CACA18,5839.7%−5.6 pts
24▼5Mendocino County, CACA88,1229.6%−3.7 pts
25▼10Trinity County, CACA15,7209.3%−13.6 pts
26▲7Yolo County, CACA224,4108.5%−0.9 pts
27▲3Napa County, CACA132,9498.3%−2.4 pts
28▲1Lassen County, CACA28,1178.2%−6.2 pts
29▲5Ventura County, CACA830,8517.8%−1.5 pts
30▲7San Diego County, CACA3,282,2487.8%−1.6 pts
31▲4San Francisco County, CACA826,0797.6%−0.5 pts
32▼4Inyo County, CACA18,1587.5%−6.7 pts
33▼2Contra Costa County, CACA1,170,0707.3%−2.5 pts
34▲2Santa Barbara County, CACA442,0657.2%−2.1 pts
35▲4Sacramento County, CACA1,618,4606.8%−2.8 pts
36▲2San Mateo County, CACA743,5686.6%−2.0 pts
37▼11Yuba County, CACA88,6916.6%−4.8 pts
38▼13Sutter County, CACA98,7876.6%−3.1 pts
39▲1San Benito County, CACA70,0826.4%−2.1 pts
40▲1Solano County, CACA455,3766.3%−2.0 pts
41▲1Orange County, CACA3,149,5076.0%−2.4 pts
42▲3Stanislaus County, CACA557,7196.0%−2.9 pts
43Glenn County, CACA28,1415.8%−3.5 pts
44▲3Alameda County, CACA1,636,6305.4%−1.1 pts
45▲1Riverside County, CACA2,544,9165.3%−2.4 pts
46▼14Colusa County, CACA21,8365.2%−2.4 pts
47▲6Monterey County, CACA433,7295.0%−1.9 pts
48▼4Madera County, CACA167,9274.9%−2.0 pts
49▲1Kern County, CACA927,0684.8%−3.0 pts
50▼2San Joaquin County, CACA823,8154.7%−2.2 pts
51Fresno County, CACA1,035,4564.6%−1.3 pts
52Santa Clara County, CACA1,914,3914.5%−1.5 pts
53▼4San Bernardino County, CACA2,224,0914.4%−2.5 pts
54▲1Kings County, CACA154,3274.2%−2.4 pts
55▲1Tulare County, CACA485,1464.1%−0.7 pts
56▲1Los Angeles County, CACA9,694,9343.8%−0.6 pts
57▼3Merced County, CACA297,2603.3%−1.8 pts
58Imperial County, CACA181,4111.7%−0.9 pts
SHOWING 1–58 OF 58

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