Plymouth is a town in Grafton County, New Hampshire, USA, in the White Mountains Region. Plymouth is located at the convergence of the Pemigewasset and Baker rivers, both of which are components of the Merrimack River watershed. The population was 5,892 at the 2000 census, and the town is home to Plymouth State University, Speare Memorial Hospital, and Plymouth Regional High School. Plymouth apartments for rent comparison page shows most up to date rent information on Plymouth apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.