With new current software we use is there a good video on how to setup sales tax for clients. Washington state tax rate changes for every city and county.
As long as you have accurate address information for the client record, the app will retrieve the exact tax for that location from a 3rd party API service that we use.
We have a guide on this here:
Let us know if you have any questions!
I do have the correct address. My software looks different then what you are showing.