What is the sales tax in zip code 63366? - The sales tax in zip code 63366 in OFallon, Missouri is 8.95% as of 2025. Use the 63366 sales tax rate calculator to calculate the sales tax for any purchase in 63366.
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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. Charles | Missouri | OFallon | 63366 | 4.225% | 2% | 1.725% | 8.95% |