Williamstown is located in west Massachusetts. Williamstown is part of Berkshire County. Williamstown has 3.39 square miles of land area and 0.03 square miles of water area. As of 2010-2014, the total Williamstown population is 4,173, which has shrunk 12.22% 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%. Williamstown median household income is $65,847 in 2010-2014 and has grown by 63.70% since 2000. The income growth rate is much higher than the state average rate of 34.34% and is much higher than the national average rate of 27.36%. Williamstown median house value is $333,900 in 2010-2014 and has grown by 47.94% since 2000. The house value growth rate is much lower than the state average rate of 77.65% and is about the same as 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 Williamstown is much better than the state average in quality. The Williamstown area code is 413.