Are you are asking for the sequence of numbers that you need to put on a letter in order to be able to mail it?. e.g.: 123 Main St. Any Town. USA, 12345. In Canada we use postal codes and there isn't only one for Toronto, there are hundreds! In order to answer your question properly go to canadapost.com and do a postal code search. You will need the person's street address, city (which you have, Toronto) and province (which you have, Ontario). A postal code is made up of 3 numbers and 3 letters, . e.g.: A1A 2B2. . Hope that helps!