Waltham

County:: Middlesex County
County Seat:: No
Area (mi²):: 12.745
State:: Massachusetts

Waltham is a city located in Middlesex County, Massachusetts. Waltham has a 2025 population of 64,067. Waltham is currently declining at a rate of -0.32% annually and its population has decreased by -1.57% since the most recent census, which recorded a population of 65,091 in 2020.

The average household income in Waltham is $143,889 with a poverty rate of 8.62%. The median age in Waltham is 35.1 years: 34.4 years for males, and 35.8 years for females.

Demographics

The racial composition of Waltham includes 62.2% White, 12.88% Asian, 7.48% Black or African American, 7.27% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Asian

Two or more races

Black or African American

Other race

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	40,257	62.2%
Asian	8,335	12.88%
Two or more races	5,946	9.19%
Black or African American	4,842	7.48%
Other race	4,706	7.27%
Native American	568	0.88%
Native Hawaiian or Pacific Islander	69	0.11%

Waltham Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Waltham's average per capita income is $71,189. Household income levels show a median of $116,560. The poverty rate stands at 8.62%.

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	$167,791	-
Families	$139,460	$173,261
Households	$116,560	$143,889
Non Families	$85,484	$107,409

$71,189

Average Income

$116,560

Median Household Income

8.62%

Poverty Rate