Plymouth is located close to the center of New Hampshire. Plymouth is part of Grafton County. Plymouth has 3.65 square miles of land area and 0.09 square miles of water area. As of 2010-2014, the total Plymouth population is 3,807, which has grown 7.91% since 2000. The population growth rate is higher than the state average rate of 6.90% and is lower than the national average rate of 11.61%. Plymouth median household income is $25,453 in 2010-2014 and has has shrunk by 30.08% since 2000. The income growth rate is much lower than the state average rate of 33.39% and is much lower than the national average rate of 27.36%. Plymouth median house value is $219,300 in 2010-2014 and has shrunk by -125.85% since 2000. The house value growth rate is much higher than the state average rate of 78.09% 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 Plymouth is much better than the state average in quality. The Plymouth area code is 603.