St-Castin is a Unincorporated area located in Madawaska, New Brunswick.

• Latitude: 47° 22' North   (decimal: 47.3667000)
• Longitude: 68° 41' West   (decimal: -68.6833000)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Settlement
• Canadian Province/Territory: New Brunswick
• Location: Madawaska
• GPS Coordinate Locator Map: St-Castin Lat/Long