
Plymouth
- County:
- Grafton County
- County Seat:
- No
- Area (mi²):
- 5.875
- State:
- New Hampshire
Plymouth is a CDP located in Grafton County, New Hampshire. Plymouth has a 2025 population of 4,421. Plymouth is currently declining at a rate of -0.05% annually but its population has increased by 3.27% since the most recent census, which recorded a population of 4,281 in 2020.
The average household income in Plymouth is $109,307 with a poverty rate of 16.36%. The median age in Plymouth is 23.2 years: 23 years for males, and 23.5 years for females.