What is the sales tax in zip code 73742? - The sales tax in zip code 73742 in Hennessey, Oklahoma is 9.75% as of 2025. Use the 73742 sales tax rate calculator to calculate the sales tax for any purchase in 73742.
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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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| Kingfisher | Oklahoma | Hennessey | 73742 | 4.5% | 4% | 1.25% | 9.75% |