A mailbox is an object found within the streets. In Toontown Online, mailboxes were animated and offered Toons a power-up in damage for Throw gags when interacting in a Cog battle. Mailboxes look different on every playground.
- An orange mailbox much like the ones from Toontown Central appears next to the Toon Headquarters in the Toon-torial whenever Doctor Surlee is there waiting for his package during the Twelve Days of Winter. For some reason, Surlee always says to never trust mailboxes.
- Some artworks created by staff members of Toontown Rewritten showcase a mailbox with wings, such as the one from above.