What number is on Carl's mailbox?

Carl’s mailbox is numbered 105.

The mailbox sits beside Carl and Ellie’s house and becomes an important symbol of their shared home. During the early part of the story, Carl protects it fiercely when a construction vehicle damages it. The mailbox bears the house number 105 and also carries painted handprints made by Carl and Ellie, showing how the object represents their life together rather than just a practical delivery box.

Carl’s attachment to the mailbox helps establish why he refuses to sell the house as the neighborhood is redeveloped. When a construction worker accidentally damages the mailbox, Carl reacts angrily and strikes the worker with his cane. The incident leads to legal consequences and pressure for Carl to move into an assisted-living facility.

The number is easy to miss because the scene focuses on Carl’s confrontation and the colorful handprints. It is also sometimes confused with nearby-looking numbers such as 115 or 110 in trivia lists. The mailbox’s emotional importance, however, is even more central than its street number: it is one of the clearest visual reminders of Carl and Ellie’s home.