All countries have a Postal Code / ZIP Code or equivalent. Ireland only very recently added them and called them Eircodes (because of course we did). It used to be slightly annoying having to find some combination of characters that the online form would accept as they often varied site to site. Interestingly enough, several of these companies had their European head-quarters in Ireland. Also having to talk to the bank manager because the cashier in a UK bank wouldn't let me open an account without giving a valid postcode for my Irish address.

EDIT: typos