What is a 9-1-1 address?
A 9-1-1 address is the "physical" address of your structure. When you dial 9-1-1 from a "land" phone in an emergency, this is the location information that is available to a dispatcher.  

Why do I need a 9-1-1 address?
When a dispatcher receives a 9-1-1 call, they need to be able to locate the caller. The dispatcher guides emergency responders to the location. In the case of "land" phones, a 9-1-1 address should be tied to it so that the dispatcher can see it automatically. This is especially important if the caller is unable to speak or the 9-1-1 address is not known.

When do I need a 9-1-1 address?
Many types of structures require a 9-1-1 address, including some types of barns, shops, buildings and garages; businesses; all houses and/or mobile homes; as well as water and cell towers. When you apply for your building permit, one of the forms you must submit is the 9-1-1 Address Application  .