What is the sales tax in zip code 80503? - The sales tax in zip code 80503 in Longmont, Colorado is 9.185% as of 2025. Use the 80503 sales tax rate calculator to calculate the sales tax for any purchase in 80503.
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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 | Longmont | 80503 | 2.9% | 4% | 1.185% | 9.185% |