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9. Ireland was the last country in Europe to introduce a national postal code system. Called "Eircodes", national postcodes were introduced only in 2014, and are still not widely used.

Sadly Eircodes are not open data, which means using them at scale (for example for geocoding) requires a license and paying a licensing fee

https://finder.eircode.ie

https://en.wikipedia.org/wiki/Postal_addresses_in_the_Republic_of_Ireland#Eircode