Independent Math Enrichment

Johns Hopkins University: Center for Talented Youth

http://cty.jhu.edu/imagine/resources/competitions/math.html

Mathematical Association of America

http://www.maa.org/math-competitions/amc-1012

USA Mathematical Talent Search

http://www.usamts.org/

IUP Math Competition

http://www.iup.edu/math/events/competition/default.aspx

Camp Euclid

http://euclidlab.org/programs/camp-euclid

Ross Mathematics Program at Ohio State

https://people.math.osu.edu/ross//

New York Math Circle

https://www.nymathcircle.org/summer

Michigan Math & Science Scholars

http://www.math.lsa.umich.edu/mmss/

Carnegie Mellon: Summer Academy for Math + Science

http://admission.enrollment.cmu.edu/pages/diversity-sams