The Exorcist was filmed in multiple locations including Georgetown, Washington, D.C., Mosul, Iraq, and the ancient site of Hatra south of Mosul. The exterior shots of the iconic MacNeil house were filmed at 3600 Prospect Street NW in Georgetown, Washington, D.C., where a false front was built to enhance the house's appearance for the movie. Many interior scenes, including those in the MacNeil residence attic, were filmed at Ceco Studios in New York City. Other notable filming sites include various locations around Georgetown University, Bellevue Hospital, Fordham University, and some interior hospital scenes shot in New York. Specifically, some filming highlights are:
- Exterior shots of the MacNeil house at 3600 Prospect Street NW, Georgetown, Washington, D.C.
- The steps beside the MacNeil house known as the "The Exorcist Stairs" in Georgetown.
- Interior scenes filmed at Ceco Studios, New York City.
- Scenes filmed at hospitals like Bellevue and Goldwater Memorial Hospital, New York.
- On-location scenes in Mosul and archaeological site Hatra, Iraq.
This multi-location setup contributed to the authentic and eerie atmosphere of the film.
