- Plum Island is an island located off the northeast coast of Massachusetts, north of Cape Ann. It is a barrier island approximately 11 miles in length. Bordered by the mouth of the Merrimack River, Plum Island is divided between four cities and towns: Newbury, Newburyport, Rowley and Ipswich. Plum Island has historically been a popular vacation destination.br br This spectacular Oceanfront Home is located directly on the ocean side of Northern Boulevard on a great part of the beach.br br This year-round home has been offered as a rental with good income for many years. A great open concept floor plan boasts cathedral ceilings, a bedroom and full bath and an ocean view deck. A second bedroom and additional living space can be found on the lower level.