What is the sales tax in Johnston city? - The sales tax in Johnston city of Iowa is 7% as of 2025. Use the Johnston sales tax calculator to calculate the sales tax for any purchase in Johnston.
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Below is a list of the state sales tax, city sales tax, and county tax rate for Johnston.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| Polk | Iowa | Johnston | 50131 | 6% | 0% | 1% | 7% |