If you're going to help, be a bit more constructive.
Many of the schools that have strong engineering or physics background usually also have strong mathematics. I'm not too sure what your level of experience with mathematics is, but I can give you a general list of good schools for the major as well as the GPA, SAT, and extracurricular involvement that correlate to a decent chance of acceptance at said school.
NOTE: If anyone has suggestions for BanSpecsMachamp or think I've tiered an institution too high or too low, just let me know and I'll adjust accordingly. This list should be relatively accurate with some adjustment needed.
Tier 1
Princeton University
Massachusetts Institute of Technology
California Institute of Technology
Harvard University
Stanford University
University of California, Berkeley (Out-of-state)
Columbia University
University of Chicago
Amherst College*
Williams College*
Swarthmore College*
Tier 2
Cornell University
Duke University
Brown University
University of California, Berkeley (In-State)
University of California, Los Angeles (In-State and Out-of-State)
University of Michigan
Georgia Institute of Technology
Northwestern University
University of Texas, Austin
University of Illinois, Urbana-Champaign
New York University
Army + Navy*
Carnegie Mellon University
Tier 3
University of Maryland, College Park a.k.a.
blarajan University
University of Minnesota, Twin Cities a.k.a. GuangCong Luo University
Pennsylvania State University
University of Wisconsin, Madison
Virginia Polytechnic Institute and State University
University of Colorado, Boulder
Purdue University
This is a rough list I generated for schools with focuses in Mathematics. I'll explain the tiering list.
Tier 1 assumes that you are in the top 2-3% of your class, have a 2250+ SAT score with 800 Mathematics, extensive STEM extracurriculars (science competitions, AMC, AIME), and Math II SAT II of 790-800 (with other SAT II Subject tests required by institution). You are basically a mathematical wizard.
Tier 2 assumes that are in the top 8-10% of your class, have a 2100+ SAT score with a 760+ Mathematics, ample to extensive STEM extracurriculars, and Math II SAT II of 750-800.
Tier 3 assumes that you are in the top 30-40% of your class, have a 2000+ SAT score with a high Mathematics score relative to Reading and Writing, and some STEM extracurriculars. SAT II scores are largely optional for admission consideration, but will help you.
*The asterisked schools are liberal arts schools. These schools have a strong focus on teaching rather than research, so you will get a strong mathematics education regardless. Although U.S. News is far from an accurate ranking, I would keep an eye out for the top ten liberal arts schools (bar women's colleges if you identify male or are anatomically female). The military academies in general have a decently concentrated focus on engineering (last time I visited West Point at least), so the mathematics education you get from those institutions are top-notch too.
Hope this was helpful,
BanSpecsMachamp . PM if you need any other help. :)
EDIT: FireBurn mentioned Harvey Mudd, which I forgot was a thing. I'm not very well versed in the non-liberal institutions that do not have graduate programs.