In Boston, in the mission hill neighborhood, I was really surprised that the Bank of America ATM handed out $10 bills instead of $20 ~5-6 years ago and that was the only ATM I've encountered that does that.

That said, it seems like all of the Bank of America and TD Bank ATMs I use in Boston are starting to let you choose the bills you want on screen. Was recently in Montreal and had the same experience there too so I'm guessing that's what ATMs are trending towards.