What is the sales tax in zip code 80304? - The sales tax in zip code 80304 in Boulder, Colorado is 9.045% as of 2025. Use the 80304 sales tax rate calculator to calculate the sales tax for any purchase in 80304.
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Below is a list of the state sales tax, city sales tax, and county tax rate for .
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
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| Boulder | Colorado | Boulder | 80304 | 2.9% | 3.86% | 1.185% | 9.045% |