Not all rankings are created equally! Make sure to take some time to understand what factors have gone into the ranking and determine whether those factors are what is important to you in your college search.
US News & World Report - National University Rankings
The Princeton Review - Best College Rankings
Macleans - Ranking of Canadian colleges/universities.
Top UK University League Table 2014 - Search for top universities in the UK by course
THE World University Rankings
QS World University Rankings
Webometrics Ranking Web of Universities