Button Island is a small island in the Hingham Bay area of the Boston Harbor Islands National Recreation Area. It is part of the Town of Hingham. The island has a permanent size of under , plus an intertidal zone of a further . It is composed of a massing of glacial till which rises to a height of above sea level. The island is managed by the town of Hingham, and access is by private boat only. The island is notable for a large oak tree, which together with several smaller oaks, cedars, and sumac cover the island. Shrub species such as bayberry and dewberry can also be found. Grasses and sea-lavender populate the inter-tidal zone. References Islands of Plymouth County, Massachusetts Boston Harbor islands Hingham, Massachusetts Coastal islands of Massachusetts