Williamstown is located in east Pennsylvania. Williamstown is part of Dauphin County. Williamstown has 0.26 square miles of land area and has no water area. As of 2010-2014, the total Williamstown population is 1,244, which has shrunk 13.19% since 2000. The population growth rate is much lower than the state average rate of 3.89% and is much lower than the national average rate of 11.61%. Williamstown median household income is $47,647 in 2010-2014 and has grown by 42.83% since 2000. The income growth rate is higher than the state average rate of 32.44% and is much higher than the national average rate of 27.36%. Williamstown median house value is $77,900 in 2010-2014 and has grown by 65.39% since 2000. The house value growth rate is lower than the state average rate of 70.00% 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 Williamstown is worse than the state average in quality. The Williamstown area code is 717.