About 400 local sales tax location codes.
Washington publishes about 400 local sales tax location codes and updates the rates every quarter. For most retail sales the code that applies is where the customer receives the merchandise or service, so a wrong code sends the tax to the wrong local government.
Transcript
Sal Washington's Department of Revenue publishes about four hundred location codes for local sales tax, and the rates are updated every quarter. For most retail sales, the code that applies is where the customer receives the merchandise or service. Code it wrong and the wrong local government gets the tax.