According to the United States Census Bureau, the town has a total area of 43.1 square miles (112 km²), of which 43.0 sq mi (111 km²) is land and 0.1 sq mi (0.26 km²) is water, comprising 0.23% of the town.
Alexandria is drained by the Fowler River.
Mount Cardigan, elevation 3,121 feet (951 m), is on the western boundary of the town.
The summit is in the town of Orange, while the highest point in Alexandria is on the Firescrew ridge to the north, where the elevation reaches 3,040 ft (930 m).
Alexandria lies fully within the Merrimack River watershed.
According to the United States Census Bureau, the town has a total area of 43.1 square miles (112 km²), of which 43.0 sq mi (111 km²) is land and 0.1 sq mi (0.26 km²) is water, comprising 0.23% of the town. Alexandria is drained by the Fowler River. Mount Cardigan, elevation 3,121 feet (951 m), is on the western boundary of the town. The summit is in the town of Orange, while the highest point in Alexandria is on the Firescrew ridge to the north, where the elevation reaches 3,040 ft (930 m). Alexandria lies fully within the Merrimack River watershed.
Alexandria, New Hampshire