What is the sales tax in Mercer Island city? - The sales tax in Mercer Island city of Washington is 10.2% as of 2025. Use the Mercer Island sales tax calculator to calculate the sales tax for any purchase in Mercer Island.
Mercer Island Sales Tax Calculator |
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Below is a list of the state sales tax, city sales tax, and county tax rate for Mercer Island.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| King | Washington | Mercer Island | 98040 | 6.5% | 3.7% | 0% | 10.2% |