In Ireland we were very late to the postcode game and when we introduced them a few years back they actually uniquely identifies a single address. We also continued our "interesting" habit of renaming everything to make them sound more Irish so they are called Eircodes. In theory you could just put the single 7 character Eircode on a letter and it would be enough although our postal service has said we can't do that.
I work in a smallish company (around 150 employees I believe) and we recently went through this career framework development and standardisation and as part of that we came up with standard levels and titles across the company but we had to make an exception for our USA office. They would all still have the standard titles internally for pay bands, career progression etc but because of customer expectations, everyone had to be a VP of this or Senior VP of that where VP elsewhere in the company was a very senior position. Kinda funny really.