The Canadian Postal Code is a standard system comprised of both letters and numbers designed to facilitate the sorting of mail. There are six total characters in the postal code, whereby the first three determine the Forward Sortation Area and the final three delineate the local delivery unit.
The Forward Sortation Area, or FSA, recognizes main geographic territories and bookends with various symbols of the alphabet. Middle entries are always single-digit numbers. Conversely, the local delivery unit, which represents more specific constituents of the FSA, initiates and concludes with numerals. Single intermediate characters are always letters.
The beginning letter in the FSA determines the province or territory to which the mail piece is destined. There are 18 corresponding regions for this area. Local delivery units contain nine unique routes which identify the precise target location of the mailing.