Watertown is located close to the center of Massachusetts. Watertown is part of Middlesex County. Watertown has 3.99 square miles of land area and 0.12 square miles of water area. As of 2010-2014, the total Watertown population is 32,880, which has shrunk 0.32% 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%. Watertown median household income is $86,461 in 2010-2014 and has grown by 44.67% since 2000. The income growth rate is higher than the state average rate of 34.34% and is much higher than the national average rate of 27.36%. Watertown median house value is $438,900 in 2010-2014 and has grown by 62.20% since 2000. The house value growth rate is lower than the state average rate of 77.65% and is 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 Watertown is close to the state average in quality. The Watertown area code is 617.