9. Ireland 🇮🇪 was the last country in Europe to introduce a national postal code system. Called "Eircodes", national postcodes where 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://en.wikipedia.org/wiki/Postal_addresses_in_the_Republic_of_Ireland#Eircode
10. The island of Ireland was historically divided into about 61,000 "townlands", a small geographical division of land of Gaelic origin.
https://en.wikipedia.org/wiki/Townland
Mapping them has been a very long-running project inthe OpenStreetMap Ireland community
https://wiki.openstreetmap.org/wiki/Ireland/Mapping_Townlands
#geoweirdness