What is the sales tax in Haddam city? - The sales tax in Haddam city of Connecticut is 6.35% as of 2025. Use the Haddam sales tax calculator to calculate the sales tax for any purchase in Haddam.
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Below is a list of the state sales tax, city sales tax, and county tax rate for Haddam.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| Middlesex | Connecticut | Haddam | 06438 | 6.35% | 0% | 0% | 6.35% |