Ireland was the last country in the OECD to create a postcode system. In July 2015 all 2.2 million residential and business addresses in Ireland received a letter notifying them of the new Eircode for their address.[4] Unlike other countries, where postcodes define clusters or groups of addresses, an Eircode identifies an individual address and shows exactly where it is located. The system was criticised...[5]

   ...for using an unsequenced code limited to postal addresses...[67][68]