The Irish post office, An Post, has published an on-line address validation system
You have to register, and then you can search to verfy any valid Irish address. The database seems to be based the delivery route, some some addresses list "nearby" major towns that the mail is routed through. Unfortunately, no geo-encoding is provided.
Thanks to Antoin antoin@eire.com ｻ An Post Irish national address database now available to the public
Tweet Posted by mofoghlu at April 3, 2006 9:44 AM