The island is privately owned and not accessible to the public and is within the jurisdiction of the Town of Southold in Suffolk County, New York in the United States.

[1] Alexander gave James Farret power to act as his agent and attorney in settling Long Island.

The island and other nearby lands in Suffolk County were confiscated in 1779[5] during the American Revolution by act of attainder, and Wickham, a Loyalist, was banished from the state.

Under a Legislature of the State act it was declared that Parker Wickham forfeited his estate and it was sold, on August 5, 1784, to Caleb Brewster and Benjamin Tallmadge[4]: 258  who had been members of the Culper Spy Ring during the American Revolutionary War.

)[11] Robins Island is owned by Wall Street financier Louis Bacon, who purchased it in 1993 at a bankruptcy court auction for $11 million.

[12] Bacon has made significant investments in restoring the neglected island, going so far as to import full-grown oak trees to replace ones harvested for lumber years earlier.

There are three main houses on the property with additional visitors' cottages, caretaker quarters, and several barns and outbuildings on the island.