Duncan is a Unincorporated area located in Grey, Ontario and has an elevation of 408 meters.

• Latitude: 44° 25' 20'' North   (decimal: 44.4222222)
• Longitude: 80° 28' 35'' West   (decimal: -80.4763888)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Dispersed Rural Community
• Canadian Province/Territory: Ontario
• Elevation: 408 meters
• Location: Grey
• Atlas of Canada Locator Map: Duncan
• GPS Coordinate Locator Map: Duncan Lat/Long