Dennis, Massachusetts Demographics & Population 2026
During the 2020–2024 ACS period, Dennis, Massachusetts had a total population of 2,424, the 172nd largest community in Massachusetts, with a median household income of $109,882, which is 6% higher than the state average. The poverty rate is 4.3%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- An exceptionally low poverty rate of 4.3% — among the lowest in Massachusetts.
- Housing affordability is a challenge — homes cost 8.6x the median household income.
Dennis Quick Facts
How Dennis Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 1,903 | 2,424 | +27.4% |
| Median household income | $127,292 | $109,882 | -13.7% |
| Median home value | $835,300 | $944,500 | +13.1% |
How Dennis Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 53 | National average: 61
Education
Educational Attainment (Adults 25+)
Dennis Rankings in Massachusetts
Explore Massachusetts Rankings
Other Cities in Barnstable County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Barnstable Town | 49,568 | $91,982 | 7.4% | $602,500 |
| South Yarmouth | 11,552 | $82,188 | 11.6% | $541,700 |
| East Falmouth | 6,245 | $81,464 | 8.6% | $593,000 |
| West Yarmouth | 6,194 | $65,841 | 9.1% | $494,600 |
| Yarmouth Port | 5,961 | $110,304 | 7.7% | $604,900 |
| East Harwich | 5,654 | $111,508 | 1.7% | $638,900 |
| Sagamore | 4,072 | $108,315 | 2.5% | $575,700 |
| Falmouth | 3,954 | $68,227 | 21.8% | $837,900 |
| Northwest Harwich | 3,932 | $107,730 | 7.5% | $665,100 |
| East Sandwich | 3,864 | $115,000 | 11.5% | $689,000 |
Cities Similar to Dennis
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Fiskdale | 2,311 | $112,400 | $409,300 | 50.8% | 7.7% |
| Sturbridge | 2,443 | $131,568 | $418,400 | 55.8% | 3.1% |
| South Lancaster | 2,177 | $109,173 | $421,400 | 52.3% | 1.3% |
| Mattapoisett Center | 2,669 | $105,500 | $651,900 | 71.6% | 5.3% |
| West Dennis | 2,556 | $95,758 | $644,800 | 43.4% | 6.9% |
Population Overview
Dennis is a small community located in Massachusetts, within Barnstable County. The total population is 2,424. It ranks as the 172nd most populous out of 248 Census-designated places in Massachusetts.
Age Demographics
The median age in Dennis is 63.3 years. This is 58% higher than the state median of 40.0 years. 27.2% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Dennis is $109,882. This is 6% higher than the state median of $103,960. It is also 36% higher than the national median of $80,734. The poverty rate stands at 4.3%. This is 57% lower than the state poverty rate of 10.0%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 3.1%. This is 39% lower than the state rate of 5.1%. The median home value is $944,500. Housing costs are 68% higher than the state median of $562,100. The home-value-to-income ratio of 8.6x suggests that housing affordability is a significant concern for many residents. 85.8% of occupied housing units are owner-occupied. This homeownership rate is 37% higher than the state average of 62.5%.
Race & Ethnicity
Dennis has a predominantly White (non-Hispanic) population, comprising 90.8% of all residents. Hispanic or Latino residents account for 8.5%.
Education
56.5% of residents aged 25 and older hold a bachelor's degree or higher. This is 20% higher than the state rate of 47.3%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 98.5%. Notably, 29.5% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Dennis, Massachusetts is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Massachusetts state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 248 Census-designated places in Massachusetts. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
Free data download: Get all Massachusetts city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of Dennis, Massachusetts?
Dennis, Massachusetts has a population of 2,424 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Dennis, MA?
The median household income in Dennis is $109,882, which is 36% higher than the national median of $80,734.
What is the poverty rate in Dennis, MA?
The poverty rate in Dennis is 4.3%. This means approximately 105 residents live below the federal poverty line.
What is the racial makeup of Dennis, Massachusetts?
Dennis's population is 90.8% White, 0.0% Black, 8.5% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Dennis, MA?
The median home value in Dennis is $944,500. The home-value-to-income ratio is 8.6x.
How educated is Dennis, Massachusetts?
56.5% of adults (25+) in Dennis hold a bachelor's degree or higher, and 29.5% hold a graduate or professional degree.