Dennis is located in east Massachusetts. Dennis is part of Barnstable County. Dennis has 4.88 square miles of land area and 0.21 square miles of water area. As of 2010-2014, the total Dennis population is 2,431, which has shrunk 13.12% since 2000. The population growth rate is much lower than the state average rate of 4.85% and is much lower than the national average rate of 11.61%. Dennis median household income is $65,750 in 2010-2014 and has grown by 28.20% since 2000. The income growth rate is lower than the state average rate of 34.34% and is about the same as the national average rate of 27.36%. Dennis median house value is $472,400 in 2010-2014 and has grown by 110.14% since 2000. The house value growth rate is higher than the state average rate of 77.65% and is much higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Dennis is much better than the state average in quality. The Dennis area codes are 508, 774.