Abstract: A mail box flag assembly for use on common domed mail boxes having a hinged front door in front. The means for mounting the flag will consist of adhesive or nuts and bolts. The flag assembly mounts on the front of the hinged front mail box door consisting of a detachable flag (that can be customized to provide house numbers, or themed logos). The flag is attached to a rotating arm that rests on a raised slotted bracket when not in use. When in use (indicating mail is contained in the mailbox for delivery by the postal carrier) the arm is rotated on a rod outward (perpendicular to the mail box door) slides downward until it fits into a raised slotted bracket that holds the flag arm in place so a postal carrier can see the extended flag and know that mail is contained in the mail box for delivery.