There were two places in the Dun Laoghaire/Kingstown area called Longford Terrace. 

• Longford Terrace, Monkstown is a set of 28 houses in two terraced blocks of Victorian buildings of exceptional quality facing on to the railway and the sea
• Longford Terrace, Dun Laoghaire/Kingstown is a former name for the road now called Park Road which faces on to the west side of the Peoples Park.  This is listed in the census as Longford Terrace East.  For details go to Park Road