The people on the list are both elderly and young.
They might have Alzheimer's disease, autism spectrum disorder, an acquired brain injury or mental health issues.
But they all share one key description — they are vulnerable.
There are just over 40 people fitting that criteria on the Barrie Police Vulnerable Person Registry.
A parent, guardian or caregiver can register someone so police and emergency responders will have that person's information, description and a current picture on file in the event he or she goes missing.
"That's the key to finding these people. Time is of the essence and every minute counts," said Barrie Police Const. Sara Bamford. "That's why this Vulnerable Person Registry is so important."
The registry was launched over two years ago and tonight Barrie Police are encouraging people to gather at the waterfront to support the program and raise awareness.
Barrie Police are hosting the third annual Home Safe 5KM Run/Walk to benefit the Alzheimer Society of Simcoe County and Autism Ontario Simcoe County.
This year police hope to raise $5,000.
The event starts and ends at Heritage Park where walkers and runners will follow a marked route of five kilometres around Kempenfelt Bay.
You can still register for $35 at Heritage park between 4:30 p.m. and 6 p.m.
A vulnerable person is defined by Barrie Police as a person who due to a medical, mental health or physical condition may exhibit patterns of behaviour that may pose a danger to that person.
Bamford says the run is named for a program that can be invaluable to citizens who need special care.
"The whole essence of it is getting home safe."
For more information about the Vulnerable Person Registry and the Home Safe event visit www.barriepolice.ca