O'Brien County's estimated 2026 population is 14,252 with a growth rate of 0.23% in the past year according to the most recent United States census data. O'Brien County is the 55th largest county in Iowa. The 2010 population was 14,405 and has seen a growth of -1.06% since that time.
Data after 2023 is projected based on recent change
Overall: 39.5 years
Female: 40.6 years
Male: 38.4 years
There are 10,680 adults, (2,989 of whom are seniors) in O'Brien County.
Female: 7,070 (50%)
Male: 7,056 (50%)
The racial composition of O'Brien County includes 87.48% White, 3.45% other race, and smaller percentages for Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 12,358 | 87.48% |
| Two or more races | 872 | 6.17% |
| Other race | 487 | 3.45% |
| Black or African American | 240 | 1.7% |
| Asian | 92 | 0.65% |
| Native American | 55 | 0.39% |
| Native Hawaiian or Pacific Islander | 22 | 0.16% |
O'Brien County's average per capita income is $46,924. Household income levels show a median of $68,356. The poverty rate stands at 13.32%.
Name | Median | Mean |
|---|---|---|
| Married Families | $99,152 | - |
| Families | $96,077 | $102,052 |
| Households | $68,356 | $84,439 |
| Non Families | $43,611 | $49,758 |
Average Income
Median Household Income
Poverty Rate
