ROCK ISLAND Sales Tax Overview
As of 2026, ROCK ISLAND, Washington has a combined sales tax rate of 8.4%. This rate includes the Washington state tax of 6.5% plus applicable county and local taxes.
This rate applies to most taxable goods and services purchased within the 98850 zip code area. Some items such as groceries, prescription drugs, and clothing may be exempt depending on Washington state law.
ROCK ISLAND Tax Examples
* Based on rate of 8.4%. Verify with your exact zip code.
ROCK ISLAND Zip Codes & Tax Rates
| Zip Code | Combined |
|---|---|
| 98850 | 8.4% |
Frequently Asked Questions
What is the sales tax rate in ROCK ISLAND, WA?
The sales tax rate in ROCK ISLAND, WA is 8.4% as of 2026. This includes the 6.5% Washington state tax plus any county and city taxes.
How many zip codes are in ROCK ISLAND, WA?
ROCK ISLAND, WA has 1 zip code in our database: 98850.
How much is sales tax on a $100 purchase in ROCK ISLAND?
On a $100 purchase in ROCK ISLAND, WA you would pay approximately $8.40 in sales tax at the average rate of 8.4%, for a total of $108.40.
Is ROCK ISLAND's sales tax rate higher than the Washington average?
Use our calculator to compare ROCK ISLAND's rate of 8.4% against other cities in Washington. Visit the Washington state page for the statewide average.