An emergency signal apparatus for alerting police, medical service, neighbors and people passing by to emergency situations that may arise in or at a residence. The apparatus is designed for mounting on an upright post or column such as is commonly used for supporting rural mailboxes and includes a flashing strobe light and a siren which can be activated by operation of a manual switch in the residence or by operating a remote switch by a radio frequency emitter. The signal apparatus preferably includes illuminated house numbers, chimes within the residence and automatic dialing of the 911 emergency telephone number with a prerecorded message giving name, telephone number and address.