I go to college in Northern California, I'm only in my second semester and I've seen a few people with knives clipped to their pockets. In California, there aren't any laws that say you can't carry a knife at a college, but my college's rules say no fixed blades. All folders are fine where I live.
I carry a knife every day, and I always have my stuff on me when I go to class. Leatherman, Knife, Lighter, all of my EDC. I've never had a problem, and I've pulled out my Benchmade 710 to cut open the packaging on my new calculator and other school stuff. No problems with anything at my college, the 710 is the biggest knife that I've used while at school, but I've also used my ZT 0301. No weird responses or reactions, some people looked, but no one seemed to care. I've never really had a problem with knives where I live.
I like northern California, mostly everyone up here is level-headed and they don't panic when they see a knife or a handgun. (Shasta County).