[3] A landing for the Lake Champlain Transportation Company's ferry to Plattsburgh, New York, at Cumberland Head is located on the western shore of Grand Isle at Gordon's Landing.

To the west, across the western channel of Lake Champlain, is the town of Plattsburgh in Clinton County, New York, while to the east, across the eastern channel of Lake Champlain, is the town of Milton in Chittenden County, and the town of St. Albans in Franklin County.

Grand Isle State Park, with frontage on Lake Champlain, is in the southeastern part of town.

There were 1,047 housing units at an average density of 63.4 per square mile (24.5/km2).

20.2% of all households were made up of individuals, and 6.9% had someone living alone who was 65 years of age or older.