Le Vieux-Fort is a Unincorporated area located in La Prairie; Roussillon, Quebec.

• Latitude: 45° 25' 13'' North   (decimal: 45.4203175)
• Longitude: 73° 29' 47'' West   (decimal: -73.4962512)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Secteur résidentiel
• Canadian Province/Territory: Quebec
• Location: La Prairie; Roussillon
• Atlas of Canada Locator Map: Le Vieux-Fort
• GPS Coordinate Locator Map: Le Vieux-Fort Lat/Long