Arlington is located close to the center of Massachusetts. Arlington is part of Middlesex County. Arlington has 5.15 square miles of land area and 0.35 square miles of water area. As of 2010-2014, the total Arlington population is 43,728, which has grown 3.16% since 2000. The population growth rate is lower than the state average rate of 4.85% and is much lower than the national average rate of 11.61%. Arlington median household income is $92,338 in 2010-2014 and has grown by 43.51% 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%. Arlington median house value is $507,200 in 2010-2014 and has grown by 78.72% since 2000. The house value growth rate is about the same as 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 Arlington is much better than the state average in quality. The Arlington area code is 781.