Hamilton County's estimated 2025 population is 14,581 with a growth rate of -0.5% in the past year according to the most recent United States census data. Hamilton County is the 53rd largest county in Iowa. The 2010 population was 15,634 and has seen a growth of -6.74% since that time.
Data after 2023 is projected based on recent change
The racial composition of Hamilton County includes 87.44% White, and smaller percentages for other race, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (87.4%)
Two or more races (6.4%)
Other race (2.5%)
Asian (1.9%)
Black or African American (1.2%)
Native American (0.3%)
Native Hawaiian or Pacific Islander (0.2%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 13,023 | 87.44% |
| Two or more races | 957 | 6.43% |
| Other race | 380 | 2.55% |
| Asian | 285 | 1.91% |
| Black or African American | 181 | 1.22% |
| Native American | 40 | 0.27% |
| Native Hawaiian or Pacific Islander | 27 | 0.18% |
Married
Widowed
Divorced
Separated
Never Married
Hamilton County's average per capita income is $50,769. Household income levels show a median of $71,750. The poverty rate stands at 7.99%.
Name | Median | Mean |
|---|---|---|
| Married Families | $99,091 | - |
| Families | $88,568 | $107,590 |
| Households | $71,750 | $88,499 |
| Non Families | $43,125 | $56,142 |
Average Income
Median Household Income
Poverty Rate