Plymouth is a city located in Grafton County New Hampshire. Plymouth has a 2020 population of 3,438. Plymouth is currently declining at a rate of 0.00% annually and its population has decreased by -22.85% since the most recent census, which recorded a population of 4,456 in 2010. Plymouth reached it's highest population of in .
The average household income in Plymouth is $104,495 with a poverty rate of 8.14%. The median rental costs in recent years comes to $1,150 per month, and the median house value is $197,300. The median age in Plymouth is 20.7 years, 20.3 years for males, and 21.4 years for females.