Here's a phonetical transcription. I found it here (click). You'll find it in The Irish Songbook, by the Clancy Brothers & Tommy Makem. I believe the book is still in print.
You'll also find the lyrics and a nice MIDI here (click) - I believe this site is partly hosted hosted by Mudcat's SKW.
-Joe Offer-

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PORTLAIRIGE

O the vlosa law ih Bort Lawriga
Fol dow fol dee fol the dad I liom
Vee feeniss pwints er clawr oun
Fol dow fol dee fol the dad I liom
Vee lawn a tee the vnawv oun.
Fol dow fol dee fol the dad I liom
Og us misha eg eel slainte
Fol dow fol dee fol the dad I liom

Au ge steghey bor auh raurren
Fol dow fol dee fol the dad I liom
Au gus trur oh tibbler u dawh
Fol dow fol dee fol the dad I liom
Near rev a weenter sauss
Fol dow fol dee fol the dad I liom
Near rauther auch la hosta
Fol dow fol dee fol the dad I liom

Auh riotsa oun correg amorouk
Fol dow fol dee fol the dad I liom
Au gus taira colleen brahlum
Fol dow fol dee fol the dad I liom
Yo mead tree dum maurnin
Fol dow fol dee fol the dad I liom
Oh brog cor tibera dor
Fol dow fol dee fol the dad I liom


https://www.youtube.com/watch?v=bGOMCoW4hko