Fort Nicholas Army Base (Gate)
Shawn and Gus are driven into the base by Ewan O'Hara in episode 4x10 “You Can't Handle This Episode”.
Willowbrooke Psychiatric Hospital (exterior)
The team talk to the head of the mental institution after a patient escapes in season 7 special “Psych the Musical”.
Appears in “Psych the Musical”.
Santa Barbara Police Department (interior)
Shawn is interrogated by Lassiter and Lucinda Barry and later talks to the chief upstairs in pilot episode.