O'Brien, OR has a population of 308 and is the 22,351st largest city in the United States. The population density is 59 per sq mi which is 49% higher than the Oregon average and 35% lower than the national average. The median age in O'Brien is 65 which is approximately 66% higher than the Oregon average of 39. In O'Brien, 37% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 17% of O'Brien residents were born in Oregon, 83% were born out of state, 0% were born outside of the United States and 0% were foreign born.
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The population density in O'Brien is 49% higher than Oregon.
The median age in O'Brien is 66% higher than Oregon.
In O'Brien 77.27% of the population is White.
In O'Brien 0.00% of the population is Black or African American.