Need Help With Setting Up Multiple Taxes Within Washington State

Hello Everyone,

I hope someone can help, this is driving me crazy. I'm working on a electronic cigarette website and i'm having an issue setting up tax rules for the state of Washington. Every zip code in the state of Washington has a different tax and I've set up a tax rule for each zip code but i can't get the cart to calculate it at the point of checkout. I've successfully setup taxes for California and a few other states but they have one tax that applies for the entire state rather than having a couple hundred. If anyone can help me with this i would really appreciate it