Plymouth is a census-designated place (CDP) and the main village in the town of Plymouth in Grafton County, New Hampshire, United States. Its population was 4,730 at the 2020 census, out of 6,682 in the entire town. The CDP includes the campus of Plymouth State University.

Plymouth is a rural town in Grafton County, New Hampshire, United States, in the White Mountains Region. It has a unique role as the economic, medical, commercial, and cultural center for the predominantly rural Plymouth, NH Labor Market Area. Plymouth is located at the confluence of the Pemigewasset and Baker rivers and sits at the foot of the White Mountains. The town's population was 6,682 at the 2020 census. It is home to Plymouth State University, Speare Memorial Hospital, and Plymouth Regional High School.