Community & Data
Demographics
A Portrait of Dennis
Dennis runs from Cape Cod Bay in the north to Nantucket Sound in the south, across five villages and 20.6 square miles of land, and it is an older town than most in the Commonwealth: 37.4 percent of residents are 65 or over, against 9.1 percent under 18. More than three quarters of its homes are owner-occupied, households average 2.1 people, and about one resident in sixteen was born outside the United States. Figures below are from the U.S. Census Bureau and the Secretary of the Commonwealth. Follow the source links for the latest.
Key Figures
Sources: US Census Bureau (data.census.gov).
Population & Households
- Population (2020 Census): 14,674
- Households: 7,116
- Persons per household: 2.1
- Foreign-born: 6.1% of residents
- Age 65 and over: 37.4%
- Under 18: 9.1%
Race & Ethnicity
- White: 89.8%
- Asian: 0.3%
- Black or African American: 2.0%
- Hispanic or Latino (any race): 5.1%
- Two or more races: 6.1%
- Speak a language other than English at home: 7.4%
Economy & Housing
- Median household income: $88,183
- Poverty rate: 7.8%
- Median home value: $564,500
- Median gross rent: $1,499
- Homeownership: 78.3% of units
- In the labor force: 56.2%
Registered Voters
Massachusetts publishes voter-registration counts by town through the Secretary of the Commonwealth; the counts below are the state’s enrollment snapshot from February 1, 2025. As in most of the state, Dennis’s largest bloc by far is voters who choose no party at all.
- Total registered: 13,401
- Unenrolled (no party): 9,033 (67.41%)
- Democrats: 2,635 (19.66%)
- Republicans: 1,611 (12.02%)
Sources
See how Dennis fits into the broader Commonwealth.