Stillorgan, formerly a village in its own right, is now a suburban area of Dublin in Ireland. Stillorgan is located in Dún Laoghaire–Rathdown, and contains many housing estates, shops and other facilities, with the old village centre still present. Stillorgan is at least partly contiguous with Kilmacud and neighbours other southside districts such as Mount Merrion, Sandyford, Leopardstown, Dundrum, Blackrock, Goatstown and Foxrock.

Dún Laoghaire–Rathdown is a county in Ireland. It is in the province of Leinster and the Eastern and Midland Region. It is one of three successor counties to County Dublin, which was disestablished in 1994. It is named after the former borough of Dún Laoghaire and the barony of Rathdown. Dún Laoghaire–Rathdown County Council is the local authority for the county. The population of the county was 233,860 at the time of the 2022 census.