Multiple realities
(covers information from several alternate timelines)
A campus was any one of a number of branch locations maintained by a university or other institution of learning.
In 1967, a student demonstration at the Santa Cruz campus of the University of California was dispersed with tear gas. (VOY: "Future's End")
Starfleet Academy maintained a campus in San Francisco. (TNG: "The First Duty"; DS9: "Explorers", "Take Me Out to the Holosuite"; DIS: "Brother") The Academy campus which one had attended was listed on officers' personnel files. (DIS: "Brother")
In the anti-time future, Data suggested to run a series of neurographic scans on Jean-Luc Picard at the biometrics lab located on the campus of the Cambridge University. (TNG: "All Good Things...")