Ireland does not use postal codes. Dublin has postal districts. While Dublin is the only county in the Republic of Ireland to have postal districts (Dublin 1 to Dublin 24), there are a number of areas within County Dublin which are not included in the Dublin postal district system such as Lucan, Swords, Dun Laoghaire and Blackrock. So the last few lines of an address for Blackrock are simply:
Blackrock
Co. Dublin
Ireland
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Ireland does not have postcodes. Dublin has postal districts for some parts of Dublin. Outside of those areas is generally known as county Dublin. Blackrock is county Dublin. So an address would end like:
Blackrock
Co. Dublin
Ireland.
For an internet form looking for a postal code, just use IE as the code.
There is no postal code for that address,
just write the persons name etc followed by the above.