Montborne is located at latitude 48.381 and longitude -122.222. The elevation of Montborne is 151 feet above mean sea level. Montborne is less then six miles away from Mount Vernon.
Montborne is located on the eastern shore of Big Lake, and the main arterial is Highway 9 that runs north to south. The majority of the area is residential with many lakefront and hillside properties. There are a few commercial businesses located along Highway 9.