Sullivan County's 2026 population is estimated at 44,024, reflecting a 0.01% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Sullivan County is the 9th largest county in New Hampshire. The 2010 population was 43,744 and has grown 0.64% since 2010.
Data after 2023 is projected based on recent change
Overall: 47 years
Female: 48 years
Male: 46 years
There are 35,958 adults, (10,288 of whom are seniors) in Sullivan County.
Female: 21,680 (49.6%)
Male: 22,035 (50.4%)
The racial composition of Sullivan County includes 92.13% White, and smaller percentages for other race, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 40,275 | 92.13% |
| Two or more races | 2,440 | 5.58% |
| Other race | 507 | 1.16% |
| Black or African American | 339 | 0.78% |
| Asian | 125 | 0.29% |
| Native American | 21 | 0.05% |
| Native Hawaiian or Pacific Islander | 8 | 0.02% |
Sullivan County 's average per capita income is $52,190. Household income levels show a median of $80,858. The poverty rate stands at 10.12%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $113,546 | - |
| Families | $100,458 | $127,321 |
| Households | $80,858 | $105,975 |
| Non Families | $49,455 | $68,075 |
Average Income
Median Household Income
Poverty Rate