St. Marys Junction is a Unincorporated area located in Perth, Ontario and has an elevation of 313 meters.

• Latitude: 43° 16' 16'' North   (decimal: 43.2711111)
• Longitude: 81° 7' 55'' West   (decimal: -81.1319444)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Railway Point
• Canadian Province/Territory: Ontario
• Elevation: 313 meters
• Location: Perth
• Atlas of Canada Locator Map: St. Marys Junction
• GPS Coordinate Locator Map: St. Marys Junction Lat/Long