Rockingham County's 2026 population is estimated at 325,969, reflecting a 0.55% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Rockingham County is the 2nd largest county in New Hampshire. The 2010 population was 295,300 and has grown 10.39% since 2010.
Data after 2023 is projected based on recent change
Overall: 45 years
Female: 46.1 years
Male: 43.7 years
There are 260,119 adults, (65,026 of whom are seniors) in Rockingham County.
Female: 160,373 (50.3%)
Male: 158,709 (49.7%)
The racial composition of Rockingham County includes 90.56% White, and smaller percentages for Asian, other race, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 288,970 | 90.56% |
| Two or more races | 17,252 | 5.41% |
| Asian | 6,262 | 1.96% |
| Other race | 3,578 | 1.12% |
| Black or African American | 2,437 | 0.76% |
| Native American | 469 | 0.15% |
| Native Hawaiian or Pacific Islander | 114 | 0.04% |
Rockingham County 's average per capita income is $69,374. Household income levels show a median of $118,331. The poverty rate stands at 4.77%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $158,378 | $190,523 |
| Families | $143,734 | $174,833 |
| Households | $118,331 | $149,721 |
| Non Families | $64,866 | $90,144 |
Average Income
Median Household Income
Poverty Rate