What is the sales tax in zip code 63021? - The sales tax in zip code 63021 in Ballwin, Missouri is 9.988% as of 2025. Use the 63021 sales tax rate calculator to calculate the sales tax for any purchase in 63021.
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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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| St. Louis | Missouri | Ballwin | 63021 | 4.225% | 1.25% | 2.263% | 9.988% |