Alder Island, NY Alder Island is a Island in Nassau County, New York. It has an elevation of 1 meters, or 3 feet. Degrees Minutes Seconds: Latitude: 40-35'54'' N Longitude: 073-34'43'' W Decimal Degrees: Latitude: 40.5984364 Longitude: -73.5787395   Share your comments and photos of Alder Island, a Island in Nassau County, NY Your comment or tip about this location: (Optional) Upload a photo taken at this location: Submit More places nearby ... Census: Point Lookout Census Designated Place Channel: Jones Inlet Island: Alder Island 3 Places found nearby

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