<p>I go to quite a small college (around 1000 students) and those in charge of residential life really put a lot of thought into pairing students. If you go to a small college, there's a much better chance of administrators carefully considering the best matches for roommates. My college seemed to not only pair roommates carefully, but put thought into the entire sections of dorms and placement of certain students with common interests, opinions or work habits.</p>
<p>However, if you go to a large university, and perhaps especially a public one, there will probably be considerably less time and concern given over specific placements and pairings among roommates. That's one of the advantages of going to a small college-- you don't easily get lost among a sea of other students, and the administration generally knows who you are and will care how you feel.</p>