Can anyone tell me a good place to find information dealing with ADHD in college students...statistics, etc.??

Off the top of my head I can't tell you anywhere to look for general statistical-type info. But there are books on dealing with college students with ADD, and books written for college students with ADD.

For college students:
College Survival Guide for Students with ADD or LD

For college admin/ learning center staff and the like:
Re-Thinking AD/HD: A Guide for Fostering Success in Students with AD/HD at the College Level

Coaching College Students with AD/HD: Issues and Answers