Merrimack County's estimated 2025 population is 158,391 with a growth rate of 0.41% in the past year according to the most recent United States census data. Merrimack County is the 3rd largest county in New Hampshire. The 2010 population was 146,395 and has seen a growth of 8.19% since that time.
Data after 2023 is projected based on recent change
The racial composition of Merrimack County includes 91.39% White, and smaller percentages for Asian, Black or African American, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Asian
Black or African American
Other race
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 141,676 | 91.39% |
| Two or more races | 6,993 | 4.51% |
| Asian | 2,512 | 1.62% |
| Black or African American | 2,478 | 1.6% |
| Other race | 1,019 | 0.66% |
| Native American | 297 | 0.19% |
| Native Hawaiian or Pacific Islander | 43 | 0.03% |
Married
Widowed
Divorced
Separated
Never Married
Merrimack County's average per capita income is $56,860. Household income levels show a median of $93,944. The poverty rate stands at 7.09%.
Name | Median | Mean |
|---|---|---|
| Married Families | $127,822 | $155,461 |
| Families | $116,752 | $142,912 |
| Households | $93,944 | $119,046 |
| Non Families | $49,688 | $63,875 |
Average Income
Median Household Income
Poverty Rate