Hi jasmel,

Please check out my previous posts to get a firm grasp of what I have implemented with my site:
http://www.zen-cart.com/forum/showth...030#post727030
http://www.zen-cart.com/forum/showth...607#post901607
http://www.zen-cart.com/forum/showth...543#post908543

For Washington State, I just kept the zone id the same = 62.
The rate should be 6.5%.
The local sales tax rate is added on top of the state tax rate.

Hope this helps.
-Jason