I'm an alumnus and local, though specifically remember this from decades ago.  It is entirely possible this got changed in 40+ years and the comma is truly present.  If all other campuses include a comma, that is hefty support UCSC should, too.

Though, your link points to the mailing address, not the official name.  I do recall learning quite specifically "there is no comma" but that was in the '80s.

Can we find a more official source online?  Or, I can call the switchboard tomorrow morning and ask.  Shouldn't be too hard to find out for sure, but there remains some question in my mind.