The download data is a resource for you to integrate into your own customized applications and for your research purposes. The files are in comma-separated (.txt) format, in zip files.
The rates are updated quarterly. You must update your rate information on the first day of the quarter to be considered properly using the technology.
Washington State Sales Tax Library
Download data
Downloading Instructions
Address data by:
ZIP + 4
These files are zipped. They will need to be unzipped to extract the data.
- 2009
- Quarter 3 (Jul 1 - Sept 30)
- Quarter 2 (Apr 1 - Jun 30)
- Quarter 1 (Jan 1 - Mar 31)
- 2008
- Quarter 4 (Oct 1 – Dec 31)
- Quarter 3 (Jul 1 – Sept 30)
- Quarter 2 (April 1 – June 30)

A few Washington zip codes start with zero. These are valid zip codes for federal tribal areas. If the files are opened using Microsoft Excel, the leading zeros may not be displayed.
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