Coos County's 2026 population is estimated at 30,864, reflecting a -0.37% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Coos County is the 10th largest county in New Hampshire. The 2010 population was 32,970 and has grown -6.39% since 2010.
Data after 2023 is projected based on recent change
Overall: 50.3 years
Female: 52.1 years
Male: 48.6 years
There are 26,257 adults, (8,152 of whom are seniors) in Coos County.
Female: 14,937 (47.8%)
Male: 16,334 (52.2%)
The racial composition of Coos County includes 93.24% White, and smaller percentages for Black or African American, other race, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 29,158 | 93.24% |
| Two or more races | 1,111 | 3.55% |
| Black or African American | 690 | 2.21% |
| Other race | 202 | 0.65% |
| Native American | 64 | 0.2% |
| Asian | 45 | 0.14% |
| Native Hawaiian or Pacific Islander | 1 | 0% |
Coos County 's average per capita income is $40,373. Household income levels show a median of $57,677. The poverty rate stands at 13.21%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $92,799 | - |
| Families | $83,196 | $107,566 |
| Households | $57,677 | $83,445 |
| Non Families | $33,486 | $46,785 |
Average Income
Median Household Income
Poverty Rate