Kilmarnock Island is a Island located in Grenville, Ontario and has an elevation of 113 meters.

• Latitude: 44° 52' 21'' North   (decimal: 44.8724999)
• Longitude: 75° 56' 10'' West   (decimal: -75.9361111)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 113 meters
• Location: Grenville
• Atlas of Canada Locator Map: Kilmarnock Island
• GPS Coordinate Locator Map: Kilmarnock Island Lat/Long