Street numbers must be posted on every building in such a manner as to be plainly visible and legible from the street. Emergency personnel depend on this identification when responding to requests for aid. This inexpensive requirement could save your life or the life of a family member in an emergency. In addition, crime watch groups and others can easily identify where criminal activity is taking place and make a more efficient report to police.

Although curb numbering is allowed, it is no substitute for having numbers on the building itself. Street numbers must contrast from their background so that they are easier to see. The minimum size of the numbers is four inches.