The Aleutian Islands are part of Alaska in the United States. Because all of the United States are in the Northern hemisphere, the Aleutian Islands occur in the Northern hemis … phere.Answered. In Travel & Places.he Aleutian Island chain is part of the state of Alaska, and is, therefore, part of the North American continent. Edit. Share to: William Galloway. 22,671 Contributions. GI Brat and former member of the US Army. Avid military history buff and reader. Former water treatment operator. Former Boy Scout Leader.