Dorchester is a Unincorporated area located in Middlesex, Ontario and has an elevation of 258 meters.

• Latitude: 42° 59' 11'' North   (decimal: 42.9863888)
• Longitude: 81° 3' 29'' West   (decimal: -81.0580555)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Compact Rural Community
• Canadian Province/Territory: Ontario
• Elevation: 258 meters
• Location: Middlesex
• Atlas of Canada Locator Map: Dorchester
• GPS Coordinate Locator Map: Dorchester Lat/Long