Canada Post has chosen post offices as the delivery channels for their USPS Zip+4 address standard. This closed system has made Zip+4 ubiquitous in Canada. In the U.S.,, the post office would never be the sole delivery channel - that would never happen. But since Canada Post has gotten it to work, it is an interesting system.
The Canadian postal service provides postal codes on current street and road addresses. Canadian Postal codes are represented by four digits and may be dispatched door-to-door by anyone. Postal codes for businesses are issued by Canada Post, and are either four-digit or six-digit.] Canada Post offers two different databases, one at population level, the other at business level for delivery by mail. In Canada, the Recommended Business Address Database (RBA) is used by the Canadian Radio-television and Telecommunications Commission (CRTC) to report cable and telecommunications distributors, radio and television companies and certain other businesses. For Canadian streets, it is necessary to use both databases when collecting mail.
However, Canada Post's database ZIP+4 also includes information from Canadian addresses expressed in the XLOOKUP (X + 2) addressing scheme. This is a system which enables tabulation of addresses and post code conversion without use of the first three postal codes of Canada Post's database. This conversion is useful to residents of towns and cities having similar postal codes within the Canada Post database but used in different cities.
The USPS conversion table uses the prefixes "US" and "CA" to determine the conversion. The, NRL, and NRM may change the data. However, only the ZIP Code Country Manual may add new ZIP Code equivalents to the USPS list. The data in ZIP Code Country Manual are so old that some probably were not even around yet! d2c66b5586