O'Brien CDP, OR Population By Ancestry in 2021 (ACS-5Yrs)

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 573 O'Brien CDP, OR population, 317 had American ancestry (55.32%), 93 had Unclassified ancestry (16.23%), and 60 had Other Groups ancestry (10.47%).

The chart below shows the top 10 ancestry groups, and the table below shows both the population and percentages for many ancestry groups.

You can also see similar information for other Oregon cities and places, and for Oregon.

NB: People could belong to one or more ancestry groups.

Data Source: US Census Bureau.

O'Brien CDP, OR Percentage of Ancestry Population in 2021

American

Unclassified

Other Groups

English

German

Norwegian

European

Italian

Irish

Scotch Irish

O'Brien CDP, OR Population By Ancestry in 2021

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Ancestry	Population	Percent of Pop. (%)
American	317	55.32
Unclassified	93	16.23
Other Groups	60	10.47
English	56	9.77
German	45	7.85
Norwegian	45	7.85
European	38	6.63
Italian	38	6.63
Irish	11	1.92
Scotch Irish	9	1.57