It's the entire San Francisco Bay Area. The computer science department takes up most of the Santa Clara Valley.There's also the fact that in order to support a Starfleet the size of which we've seen, they need more than one "academy" to create that many officers. Yet we only ever hear of the academy in San Francisco. There are a few smaller schools, but they seem to be annexes rather than separate schools.
Do we know how large the Academy is?
