There is the Seneca gaming, Seneca Allegany, Seneca Niagra and then Turning Stone. That's all that Im aware of for north western New York. Actually, Turning Stone is north central, being just an hour west of Albany.

Here's the link to Awkesasne's site. They're still open, but in the very far north east of New york, right below Canada. In fact, not too far from Montreal if you're in the mood for a side trip.
http://www.mohawkcasino.com/