Idaho is bordered by Montana and Wyoming on the east and by Washington and Oregon on the west. Total Area Idaho covers 83,574 square miles, making it the 14th largest of the 50 states. Land Area: 82,751 square miles of Idaho are land areas. Water Area: 823 square miles of Idaho are covered by water. Highest Point: The highest point in Idaho is Borah Peak at 12,662 feet above sea level. Lowest Point