Many countries use codes to speed the processing of mail. In the US (and a few other countries due to the influence of the US), these codes are called zip codes. (ZIP was originally an acronym for...
Same thing, different country. Postal codes refer to Canadian destinations , Zip Codes are U.S.A. destinations.
+234
Do you mean the country of Qatar or the Iranian city of Qater? I mean, really, could you possibly be a bit more specific.
The postal code of Nigeria is 999999*