What is the sales tax in Gaithersburg city? - The sales tax in Gaithersburg city of Maryland is 6% as of 2025. Use the Gaithersburg sales tax calculator to calculate the sales tax for any purchase in Gaithersburg.
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Below is a list of the state sales tax, city sales tax, and county tax rate for Gaithersburg.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| Montgomery | Maryland | Gaithersburg | 20877 | 6% | 0% | 0% | 6% |