Grantham

County:: Sullivan County
County Seat:: No
Area (mi²):: 27.217
State:: New Hampshire

Grantham is located in Sullivan County, New Hampshire. Grantham has a 2025 population of 3,484. Grantham is currently growing at a rate of 0.09% annually and its population has increased by 2.29% since the most recent census, which recorded a population of 3,406 in 2020.

The average household income in Grantham is $145,971 with a poverty rate of 0%. The median age in Grantham is 51 years: 53.5 years for males, and 50.6 years for females.

Demographics

The racial composition of Grantham includes 100% White, and smaller percentages for Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander, other race, Two or more races and multiracial populations.

Population by Race

White

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Other race

Two or more races

Race	Population	Percentage (of total)
White	3,434	100%
Black or African American	0	0%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%
Two or more races	0	0%

Grantham Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Grantham's average per capita income is $75,071. Household income levels show a median of $113,510. The poverty rate stands at 0%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$159,200	-
Families	$134,833	$164,026
Households	$113,510	$145,971
Non Families	$60,818	$66,531

$75,071

Average Income

$113,510

Median Household Income

0%

Poverty Rate