Dublin postal districts have been used by Ireland's postal service, known as An Post, to sort mail in Dublin. The system is similar to that used in cities in Europe and North America until they adopted national postal code systems in the 1960s and '70s. These were incorporated into a new national postcode system, known as Eircode, which was fully implemented in 2015. Under the new Eircode system, the Dublin Region incorporates the original routing areas D01 to D24, along with new A## and K## codes for the remainder of the county.