Hillsborough County's 2026 population is estimated at 436,388, reflecting a 0.69% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Hillsborough County is the largest county in New Hampshire. The 2010 population was 401,064 and has grown 8.81% since 2010.
Overall: 41 years
Female: 41.9 years
Male: 40.1 years
There are 342,682 adults, (73,818 of whom are seniors) in Hillsborough County.
Female: 212,403 (49.8%)
Male: 213,975 (50.2%)
The racial composition of Hillsborough County includes 81.56% White, 4.31% Asian, and smaller percentages for other race, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 347,760 | 81.56% |
| Two or more races | 38,285 | 8.98% |
| Asian | 18,375 | 4.31% |
| Other race | 10,802 | 2.53% |
| Black or African American | 10,520 | 2.47% |
| Native American | 598 | 0.14% |
| Native Hawaiian or Pacific Islander | 38 | 0.01% |
Hillsborough County 's average per capita income is $62,194. Household income levels show a median of $103,545. The poverty rate stands at 6.74%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $145,447 | $175,313 |
| Families | $127,500 | $157,057 |
| Households | $103,545 | $132,601 |
| Non Families | $62,267 | $81,616 |
Average Income
Median Household Income
Poverty Rate