Creator
Chris Claremont, Paul Smith
  
Chris Bachalo, Scott Lobdell
  
Base
The Xavier Institute, Salem Center, Westchester County, New York State, (former) The Alley (beneath Manhattans surface), X-Factor Is sentient starship
  
Utopia; formerly New Warriors HQ; Xavier Institute for Higher Learning, Salem Center, Westchester County, New York; Massachusetts Academy, Snow Valley, Massachusetts