What is the sales tax in Boulder city? - The sales tax in Boulder city of Colorado is 9.055% as of 2026. Use the Boulder sales tax calculator to calculate the sales tax for any purchase in Boulder.
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Below is a list of the state sales tax, city sales tax, and county tax rate for Boulder.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| Boulder | Colorado | Boulder | 80301 | 2.9% | 3.87% | 1.185% | 9.055% |