Furzey Island lies within the civil parish of Corfe Castle.

The parish forms part of the Dorset (formerly Purbeck local government district).

[3] In February 2004, Channel 4's archaeological television programme Time Team found evidence of Iron Age commercial activity on Green Island.

The remains of an Iron Age furnace were discovered, along with evidence of the production of shale jewellery.

However, due to the lack of shale jewellery found in the surrounding Dorset area, archaeologists theorized that Green Island was a centre of production that exported its goods to continental Europe.