There was a former CC poster who was a writer and did specific investigation into content of undergraduate creative writing programs.
From her posts, and some others during the same period, I “harvested” the following schools (just lists, not in any “ranking order”):
Northeast: Sarah Lawrence, Middlebury, Hamilton, Bard, Trinity (CT), Bennington, Amherst, Williams, Vassar, Princeton, NYU, Tufts, Cornell, Johns Hopkins, Emerson, U Pittsburgh, SUNY New Paltz
Midwest: Kenyon, U Iowa, Oberlin, Grinnell, Northwestern, Denison, Beloit, Knox (Il)
West: Pomona, Reed, Stanford, U Redlands, U Denver, U Oregon, UC Riverside, UC Irvine, SF State
However that compilation was made quite a while ago.
Since then I have heard good things from students who took them about creative writing courses at Cornell, Barnard, and (a little further west) Oberlin. And a fairly recent CC student investigated and thought highly of the program at Penn. Though he ultimately chose Princeton.