The Laois champions were too strong for the challenge of Old Leighlin.
Portarlington booked their place in the quarter finals of the Leinster Football Championship over the weekend.
Pat Roe's side were convincing 1-12 to 0-6 winners over Carlow side Old Leighlin in the first round on Saturday night.
Rioghan Murphy added a late goal to finish with 1-2, while Colm Murphy finished with 0-4 for the Laois side.
The victory now means Portarlington will take on Louth champions Naomh Mairtin in two weeks time.
Manager Pat Roe says he's happy to get to the next round:
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