O'Brien County's estimated 2026 population is 14,646 with a growth rate of 1.34% in the past year according to the most recent United States census data. O'Brien County is the 52nd largest county in Iowa. The 2010 population was 14,405 and has seen a growth of 1.67% since that time.
Data after 2023 is projected based on recent change
The racial composition of O'Brien County includes 89.92% White, and smaller percentages for other race, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (89.92%)
Two or more races (4.83%)
Other race (2.71%)
Black or African American (1.32%)
Asian (0.61%)
Native American (0.31%)
Native Hawaiian or Pacific Islander (0.3%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 12,682 | 89.92% |
| Two or more races | 681 | 4.83% |
| Other race | 382 | 2.71% |
| Black or African American | 186 | 1.32% |
| Asian | 86 | 0.61% |
| Native American | 44 | 0.31% |
| Native Hawaiian or Pacific Islander | 42 | 0.3% |
Married
Widowed
Divorced
Separated
Never Married
O'Brien County's average per capita income is $47,227. Household income levels show a median of $68,216. The poverty rate stands at 13.81%.
Name | Median | Mean |
|---|---|---|
| Married Families | $99,250 | - |
| Families | $93,516 | $99,383 |
| Households | $68,216 | $81,625 |
| Non Families | $40,863 | $47,752 |
Average Income
Median Household Income
Poverty Rate
