What is the sales tax in Castle Rock city? - The sales tax in Castle Rock city of Colorado is 8.1% as of 2025. Use the Castle Rock sales tax calculator to calculate the sales tax for any purchase in Castle Rock.
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Below is a list of the state sales tax, city sales tax, and county tax rate for Castle Rock.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| Douglas | Colorado | Castle Rock | 80109 | 2.9% | 4.2% | 1% | 8.1% |