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 and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	1,884	99%
Two or more races	19	1%

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