How does Eircode work?
Each home, business and government agency have an Eircode. The Eircode itself is made up of 7 characters (i.e. D02 N403) divided into 2 parts. The first 3 characters are known as the ‘Routing Key’. These are typically shared by a cluster of properties in the same area.
Routing keys aren’t directly linked with town or county names. The exception to this is in Dublin, where the first 3 characters are the postcode.
The following 4 characters are a mix of numbers and letters that act as a unique identifier for specific addresses.