The uninhabited island is only 3.789 acres (1.533 ha), and is located at latitude 48° 27' 29" N, longitude 122° 57' 19" W, off the southeastern tip of San Juan Island, in the channel between that island and Lopez Island.

Since 1975 it has been managed as a nature preserve by The Nature Conservancy, following the Management Plan and Baseline Study for Goose and Deadman Island Preserves, along with Deadman Island. Visiting the island is prohibited, except for researchers from the University of Washington's Friday Harbor Laboratories.

• Goose Island: Block 3032, Census Tract 9603, San Juan County, Washington United States Census Bureau

• U.S. Geological Survey Geographic Names Information System: Goose Island (San Juan Islands)

48°27′29.1″N 122°57′24.5″W / 48.458083°N 122.956806°W / 48.458083; -122.956806