San Fran State has about 30 (I think) GLOs on campus BUT is a small system, the biggest org has AT most 60 people.. the smallest less than 20 the students and admin. are fairly anti greek... but there are some things of interest about our system...
1st is that the local organizations out number the national (IFC, NPC, NPHC Etc) orgs by quite a bit... 3 NPC orgs, 3 NIC frats (1 of which is VERY small) the rest of the afore mentioned 30 orgs are local in nature (I think 1 belongs to the multicultural council)
2nd The system is fairly young... (My chpater, is one of the oldest on campus and was founded in 1981) but this is only because we were kicked off campus in the 60's "damn the man" revolution

I could go on, but I don't know if you want that much info or now
I know UCLA's system is old and it is pretty large from friends... but it's not too well received by some... UCLA is such a huge school that even a lot of people don't make up a large percentage of general university's population.
CSU Bakersfield only has 2 NPC sororities... (Phi Sigma Sigma) and Gamma Phi Beta)
Stanislaus only has 2 NPC sororities (Phi Sig and Alpha xi Delta) ... but the school is very supportive of the greeks and greeks are very active on campus and support the only social scene on a commuter campus. we have a transfer from there and she told us about their system
Chapman, I know that they just added a Alpha Gam chapter (our AGD's went down there to help charter it) this year... so they must be growing #'s wise and pretty strong to support expansion... I'm not sure if that's the type of info you need.. and I don't know too much about fraternity life at some of these schools.. but I hope this helped you !!
Honestly I think out of all the schools where I *personally* know people involved in the greek system I'd have to say that USC or Berkely is the strongest system in the state. They are both old, established systems with beautiful houses and chapters that have a good amount of people in them. Although Berkely has been putting some restraints on alcohol and whatever (which, BTW as someone who has attended parties in those lovely houses in the hills there's still PLENTY of alcohol flowing, they just know who's consuming it now becuase of guests lists)... The university still supports greek life by having paid advisors, easy acess to facilities for events and all that good stuff. USC the system seems very united and supported by the university
hope that helped you, sorry I don't know more specifically about fraternities, but I pay more attention to sororities beause I know more about how they work