The point is that although our sales tax is high in Washington, partly because we do not have in income tax, it's still not as high as California, which DOES have an income tax--and a pretty hefty income tax at that.
Hence when we tell Californians that not having an income tax is not as great as it sounds because it means we pay an outrageously high sales tax, and then they realize that our outrageously high sales tax is lower than theirs, it is funny.
No ones pays as low as 6.5% here, though, because there are county and local taxes. The state is divided into a bunch of small regions for tax purposes (about 2.6 million locations), roughly corresponding to zip+5 regions, not not exactly. I've got a database giving the rate in each of these locations.
Checking that database, the minimum actual sales tax is 7%, the maximum is 9.5%, and the average (giving equal weight to each location) is 8.6%.
Here are all the rates, and how many locations have each rate:
+---------+----------+
| rate | count(*) |
+---------+----------+
| 0.07000 | 22526 |
| 0.07500 | 12404 |
| 0.07600 | 38365 |
| 0.07700 | 172606 |
| 0.07800 | 258871 |
| 0.07900 | 174886 |
| 0.08000 | 65948 |
| 0.08100 | 118239 |
| 0.08200 | 148568 |
| 0.08300 | 43973 |
| 0.08400 | 115138 |
| 0.08500 | 131129 |
| 0.08600 | 224180 |
| 0.08700 | 210720 |
| 0.09200 | 41020 |
| 0.09300 | 282441 |
| 0.09500 | 622649 |
+---------+----------+