I don't live in Washington - but I think there are some generalizations which apply everywhere. Here in Boston, there are several things which influence new-graduate pay:
1. Unions (starting pay is higher)
2. Academic teaching hospitals vs. community hospitals (my understanding is that the community hospitals actually start a little higher)
3. Pre-RN experience. (Though unlikely, it never hurts to ask if your EMT/LPN/etc. experience could start you out at a higher rate)
4. Urban/Rural (If what you really want the highest per/hour wage - move to NYC, or L.A., or San Francisco - just remember, your cost of living will change as well...)
5. Differentials (While I start lower, my hospital's diffs are much higher than other hospitals, I end up ahead).
Hope that helps. There are many threads which address this topic, but I think it is important to realize that pay should not always be the deciding factor. I work at an academic teaching hospital in Boston that starts several dollars less than some other hospitals in the area - but I am treated well, there are opportunities for advancement, my ratios are great, and I love and respect my co-workers.