As of 2014, postal codes in Dublin consist of numbers between 1 and 24. Odd-numbered postal districts are for addresses north of the River Liffey, and most of the even-numbered postal districts on the south side.
The exception to the odd and even rule for postal districts in Dublin is a section of the Phoenix Park (which lies in Dublin 8) and Chapelizod Village (in Dublin 20), despite the fact that they are north of the River Liffey. One district incorporates a letter and a number; Dublin 6W is a section of South Dublin that includes Harold’s Cross, Templeogue and Terenure.
In 2013, Pat Rabbitte, Ireland's minister for communications, announced a new seven-digit alphanumeric postcode system across Ireland starting in 2015. In Dublin, the first three digits of the new postcode are the same as the current postal district.