Vassar makes lists on here all the time for music 
Here are the BA programs near NYC that I posted above, with Vassar’s jazz ensembles. Chemusic so glad your family had such a good experience at Vassar…
https://www.sarahlawrence.edu/undergraduate/arts/music/
https://music.vassar.edu/ensembles/jazz.html
http://music.bard.edu/about/ (not the conservatory)
http://jazz.columbia.edu/