Not everyone does. "In February 2005, 117 of the 190 member countries of the Universal Postal Union had postal code systems. Countries that do not have nationa

Not everyone does. "In February 2005, 117 of the 190 member countries of the Universal Postal Union had postal code systems. Countries that do not have national systems include Ireland and Panama." http://en.wikipedia.org/wiki/Postal_code http://en.wikipedia.org/wiki/Postal_code