Mendasarkan
Xavier Institute, Salem Pusat, Westchester County, New York State, (mantan) The Alley (di bawah Manhattans permukaan), X-Factor Apakah kapal luar angkasa hidup
(Saat ini) Profesor Charles Xaviers Institute for Higher Learning, Salem Pusat, Westchester County, New York (mantan) Muir Isle, Skotlandia ,; loteng di Soho, Manhattan, Ust-Ordynski Kolektif, Danau Baikal, Siberia, Uni Soviet, X-Men Markas di Austra