US Population With Last Name Obrien By Race and Ethnicity in the 2000 Census
Updated on May 9, 2026.
Data Source: US Census Bureau.
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In the 2000 Census, there were 115,385 people in the US whose last name was Obrien, and the rate of occurence of the Obrien last name was 42.77 per 100K.
The highest percentage of people with the last name of Obrien identified their race as Non Hispanic White Alone (95.31%); the second highest percentage of people identified their race as Hispanic or Latino (1.52%); and the third highest percentage of people identified their race as Non Hispanic Two or More Races (1.18%).
The table below below shows by race and ethnicity, the number of people and the percentage of the total people with the Obrien last name.
US Population With Last Name Obrien By Race And Ethniciity in the 2000 Census
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| Last Name | Number of People | Percent of Total (%) |
|---|---|---|
| Non Hispanic White Alone | 109973 | 95.31 |
| Hispanic or Latino | 1754 | 1.52 |
| Non Hispanic Two or More Races | 1362 | 1.18 |
| Non Hispanic Black or African American Alone | 1304 | 1.13 |
| Non Hispanic Asian and Native Hawaiian and Other Pacific Islander Alone | 612 | 0.53 |
| Non Hispanic American Indian and Alaska Native Alone | 381 | 0.33 |