Ilion lies southeast of the mountain Aigaleo, 6 km (4 mi) northwest of Athens city centre. The municipality has an area of 9.453 km2.
Neighbouring municipalities are Agioi Anargyroi-Kamatero to the north and east, Petroupoli to the northwest and Peristeri to the south. The main streets are Fylis Avenue, Thivon Avenue, Idomeneos Street and Protesilaou Street.
Sites of interest
- National Sports Center of Nea Liosia
- Environmental Awareness Park "Antonis Tritsis"
- Forklore Museum
- Cultural Center