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This pest can cause significant damage to your house. There are many types of carpenter ants throughout the U.S. measuring in size from one-quarter inch (about the width of a pencil) for a worker carpenter ant to three-quarters of an inch (about the size of a quarter) for a queen carpenter ant. Each colony is established by a single, fertilized queen.
Carpenter ants vary in size based on their role in the colony and genus, but generally are much larger than any of the numerous varieties of common household ants. Among the most common species of black carpenter ant in North America, Campontonus pennsylvanicus, sizes vary between 5/16 inch (0.8 cm) to 1 inch (2.54 cm).1  Winged queen: The queen is the largest ant in the colony, and can be as long as 1 inch (2.54 cm). Winged queen: The queen is the largest ant in the colony, and can be as long as 1 inch (2.54 cm). 2  Winged reproductives, males and females: 3/4 inch (1.9 cm). 3  Major workers: Among black carpenter ants, they range from 3/8 to 1/2 inch (1 cm to 1.3 cm).