Dennis is a city located in Massachusetts. Dennis has a 2020 population of 2,360. Dennis is currently declining at a rate of 0.00% annually and its population has decreased by -1.95% since the most recent census, which recorded a population of 2,407 in 2010. Dennis reached it's highest population of 2,551 in 2015.
The average household income in Dennis is $107,915 with a poverty rate of 4.28%. The median rental costs in recent years comes to $1,142 per month, and the median house value is $506,400. The median age in Dennis is 66 years, 65.7 years for males, and 66.2 years for females. For every 100 females there are 88.8 males.