Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Green Island is a coterminous town and village in Albany County, New York, USA some 8 miles north of Albany, New York. Green Island is one of only five such town-village amalgams in New York. The population was 2,620 at the 2010 census. The postal code is 12183. Green Island is also the smallest town, by area, in New York, covering 0.7 of a square mile; by contrast, the largest town in the state by area, Webb, covers 483 square miles.