<p>As a more or less scientific way to pick a college, you might look at where graduate students in math did their undergraduate studies. I came across a posting on Reddit where some people did this.</p>
<p>To pick on math graduate students at the University of Chicago (just because it is not a school on the east or west coasts, and so might be a slightly more impartial sample), here are the undergraduates origins of their students. According to that posting, and listing only the schools which sent multiple students to graduate school at Chicago, here are the numbers.</p>
<p>University Number
Caltech 5
MIT 5
Princeton 3
Reed 3
Bard College 2
Brown 2
Harvard 2
Ohio State 2
Swarthmore 2
Yale 2</p>
<p>Now these may not be statistically significant figures, but it might give you a couple more ideas for schools.
It should be noted that not all schools are the same size, for example Reed has 1400 undergraduates (and only a fraction of those doing science and math majors), Harvard 7,000 and Ohio State, 44,000. </p>
<p>Also, if you have an interests in the humanities, you may want to consider other liberal art colleges, a la Reed and Swarthmore, that have high powered math departments, like Williams and Harvey Mudd. </p>