Sales tax in Castle Rock, Washington: 7.9%
State 6.5% + local 1.4%. In effect October 1 – December 31, 2026.
Source: dor.wa.gov, checked 2026-10-09.
- Castle Rock is in Cowlitz County.
- 309 of 329 Washington locations we list have a higher combined rate.
- Combined rates in Washington range from 7.6% to 10.7%.
Sales tax on common amounts in Castle Rock
| Price | Sales tax | Total |
|---|---|---|
| $10.00 | $0.79 | $10.79 |
| $25.00 | $1.98 | $26.98 |
| $50.00 | $3.95 | $53.95 |
| $100.00 | $7.90 | $107.90 |
| $500.00 | $39.50 | $539.50 |
| $1,000.00 | $79.00 | $1,079.00 |
Rates apply where the buyer receives the goods. Parts of some cities lie outside the regional transit (RTA) area and pay a slightly lower rate. For an exact street address, use the Washington Department of Revenue tax rate lookup. Lodging, vehicle and prepared-food taxes can be extra.
Calculate tax on any amount
Frequently asked questions
What is the sales tax rate in Castle Rock, Washington?
The combined sales tax rate in Castle Rock, Washington is 7.9%: the 6.5% state rate plus 1.4% in local taxes, according to the state's official rate file.
How much is sales tax on $100 in Castle Rock?
$7.90, for a total of $107.90.
Sources and method
- Local sales & use tax rates (Q4 2026), Washington State Department of Revenue
- Current Sales and Use Tax Rates (by county), North Carolina Department of Revenue
Combined rate = state rate + local rates (including transit where listed). Prepared-food, lodging, vehicle and other special taxes are not included.