Dennis

County:: Barnstable County
County Seat:: No
Area (mi²):: 4.911
State:: Massachusetts

Dennis is a CDP located in Barnstable County, Massachusetts. Dennis has a 2025 population of 1,771. Dennis is currently declining at a rate of -2.32% annually and its population has decreased by -9.73% since the most recent census, which recorded a population of 1,962 in 2020.

The average household income in Dennis is $163,917 with a poverty rate of 3.31%. The median age in Dennis is 63.2 years: 64 years for males, and 61.7 years for females.

Demographics

The racial composition of Dennis includes 99% White, and smaller percentages for Two or more races, Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	1,884	99%
Two or more races	19	1%
Black or African American	0	0%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Dennis Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Dennis' average per capita income is $72,135. Household income levels show a median of $127,292. The poverty rate stands at 3.31%.

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	$171,645	-
Families	$163,864	$196,202
Households	$127,292	$163,917
Non Families	$58,983	$79,781

$72,135

Average Income

$127,292

Median Household Income

3.31%

Poverty Rate