What is the sales tax in Keystone city? - The sales tax in Keystone city of South Dakota is 6.2% as of 2025. Use the Keystone sales tax calculator to calculate the sales tax for any purchase in Keystone.
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Below is a list of the state sales tax, city sales tax, and county tax rate for Keystone.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| Pennington | South Dakota | Keystone | 57751 | 4.2% | 2% | 0% | 6.2% |