Samara Joy graduated from Purchase a few years ago and more or less immediately won a grammy. Then another one. My son spent 5 semesters in high school playing in the jazz combos there including two semesters with a very talented vocalist who loved my son because he did not play over her. Conversations with her father indicated she was doing well there. Search on YouTube for Purchase Jazz, and you should find a few good videos of her.
Also, the New Jersey schools, William Paterson and Montclair State have killer jazz programs.