Non-profit organizations that are eager to reach college students?

Non profits are having hard times right now. Funding has been stagnant or eliminated in many areas.
If your long range goals are to be involved with non profits you may consider volunteering to get your foot in the door.

it depends on your definition of “reach”? If you mean work with, the first one that comes to mind is “Teach for America” – they’re all over college campuses. Can you be more specific?