The addresses used in the census have been extracted from the Geodirectory, the An Post national address database, by the CSO. These addresses are listed in record books for use by enumerators, who write the address on the front of the form before handing it over to the householder.
In a small number of instances the address in the record book may be different to that used by the householder. This can happen for a number of reasons but in all instances the enumerators are instructed to record the address as provided by the householder onto the form, and into their record book. A reminder circular issued to all 5,144 field staff with regards to this early on in the campaign.
All dwellings in the census are also identified by way of an x, y coordinate and it is these coordinates that are used to create census outputs, and place dwellings in the correct Electoral Divisions etc. for the compilation of census outputs. Addresses are not used in the creation of census outputs so any disparities that have been found in census addresses have no impact on the outputs census will produce.
As part of their delivery routine enumerators have also written the Eircode of the dwelling onto the census form. These Eircodes were extracted from the Geodirectory, along with the addresses, and in some instances may differ from those provided by Eircode.ie. Census enumerators have been instructed to advise the householder to check back with Eircode.ie if they have any queries regarding the correct Eircode for their particular dwelling.