Green Island, New York, is a village located on the west side of the Hudson River, just south of Cohoes and across the river from Troy. The village's population is about 2,500. Despite its name, Green Island is not on an island.
Classifying Green Island businesses can be complicated, as the U.S. Post Office treats the village as part of Troy. Businesses that are physically located in Green Island belong in this category even when they have a Troy P.O. box, as do "Troy" locations with a 12183 zip code.