It is in the Dublin 12 postal district and is adjacent to the areas of Crumlin, Greenhills, Kimmage, Templeogue, Terenure, and Walkinstown.

Old Ordnance Survey maps show the townland having an area of 89 acres, 3 roods, and 35 perches, which is equivalent to 36.41 hectares (0.36 square kilometres).

The closest light rail link is Kylemore Luas Stop on the Naas Road.

[2][3] The Ashleaf Shopping Centre is to the north of Perrystown, containing a Dunnes Stores and several other small outlets.

The cyclists competing in Stage 1 of the 1998 Tour de France (which started in Ireland that year) passed within 100 yards of the village of Perrystown during this stage (Greentrees Road - Willington Roundabout - Templeville Road) on the way to 1987 Tour de France winner Stephen Roche's hometown of Dundrum in Dublin, and finished back in Dublin City Centre via County Wicklow to complete the stage.