What is the sales tax in zip code 51003? - The sales tax in zip code 51003 in Alton, Iowa is 7% as of 2025. Use the 51003 sales tax rate calculator to calculate the sales tax for any purchase in 51003.
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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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| Sioux | Iowa | Alton | 51003 | 6% | 0% | 1% | 7% |