Drimnagh is bounded by Crumlin Road to the east (starting at Sundrive Road junction and continuing along Drimnagh Road to the Halfway House); by Landsdown Valley to the south; by Davitt Road to the west (from the Canal, along Davitt Road to Suir Bridge and along Parnell Road to Herberton Bridge and Herberton Road junction with Crumlin Road); and by Dolphin Road to the north.

Drimnagh is in the Dail constituency of Dublin South Central and is comprised of the electoral wards of Crumlin A, B, E and F.It is situated in the postal district of Dublin 12
.