Mercer Island, WA is in zip code 98040. The current total local sales tax rate in Mercer Island, WA is 10.100%. The 2020 total local sales tax rate was 10.000%.
| District | Rate |
|---|---|
| Washington State | 6.500% |
| King County | 3.600% |
| Mercer Island | 0.000% |
| Total | 10.100% |