While my list is a bit short:
Writer's Digest Your Story Winner #22 - He Plays Expert
The Sun - Reader's Write, Teenagers (Bradshaw Whitaker)
A little Noir Writing Contest (I'm counting this - I won!)
I have few YA short stories that won contests on Inkpop, but it is no longer. It joined with Figment and my pieces didn't transfer over. "Que Sera, Sera"