Hamilton County's 2026 population is estimated at 393,936, reflecting a 1.84% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Hamilton County is the 4th largest county in Indiana. The 2010 population was 276,499 and has grown 42.47% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.4 years
Female: 39.1 years
Male: 37.6 years
There are 272,320 adults, (50,673 of whom are seniors) in Hamilton County.
Female: 185,327 (50.8%)
Male: 179,729 (49.2%)
The racial composition of Hamilton County includes 80.19% White, 6.88% Asian, 4.48% Black or African American, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 292,742 | 80.19% |
| Asian | 25,107 | 6.88% |
| Two or more races | 24,695 | 6.76% |
| Black or African American | 16,360 | 4.48% |
| Other race | 5,648 | 1.55% |
| Native American | 341 | 0.09% |
| Native Hawaiian or Pacific Islander | 163 | 0.04% |
Hamilton County 's average per capita income is $73,465. Household income levels show a median of $121,530. The poverty rate stands at 4.39%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $159,805 | $199,957 |
| Families | $146,219 | $184,812 |
| Households | $121,530 | $158,610 |
| Non Families | $63,964 | $83,208 |
Average Income
Median Household Income
Poverty Rate