Ranking of California Counties By Percentage of Population with Celtic Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 4.61K people in California with Celtic ancestry (0.01% of California population). Among all California counties, Trinity County had the highest percentage of its population with Celtic ancestry (0.60%), followed by Modoc County (0.23%), and Tuolumne County (0.06%).

The chart and table below shows the top 10 counties with high percentage of its population having Celtic ancestry.

You can see similar information for other states and for other ancestry groups in California.

Data Source: US Census Bureau.
Ranking of California Counties By Percentage of Population with Celtic Ancestry in 2021
Trinity County
Modoc County
Tuolumne County
Amador County
Butte County
Calaveras County
Humboldt County
Marin County
Mariposa County
Napa County
Ranking of California Counties By Percentage of Population with Celtic Ancestry in 2021
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Rank County Percentage of Pop. (%)
1 Trinity County 0.60
2 Modoc County 0.23
3 Tuolumne County 0.06
4 Amador County 0.05
5 Butte County 0.04
5 Calaveras County 0.04
5 Humboldt County 0.04
5 Marin County 0.04
5 Mariposa County 0.04
5 Napa County 0.04
5 Santa Barbara County 0.04
5 Shasta County 0.04
6 Madera County 0.03
6 San Luis Obispo County 0.03
6 Santa Cruz County 0.03
6 Sonoma County 0.03
7 Contra Costa County 0.02
7 Fresno County 0.02
7 Inyo County 0.02
7 Monterey County 0.02
7 Placer County 0.02
7 Sacramento County 0.02
7 Sutter County 0.02
7 Ventura County 0.02
8 Alameda County 0.01
8 El Dorado County 0.01
8 Imperial County 0.01
8 Kern County 0.01
8 Kings County 0.01
8 Los Angeles County 0.01
8 Nevada County 0.01
8 Orange County 0.01
8 Riverside County 0.01
8 San Diego County 0.01
8 San Francisco County 0.01
8 San Mateo County 0.01
8 Santa Clara County 0.01
8 Solano County 0.01
8 Stanislaus County 0.01
9 Tulare County 0.005
10 San Bernardino County 0.004
10 San Joaquin County 0.004