Did you receive Form 1099-B for this transaction? If so, the redemption was taxable, and you should enter Form 1099-B to report proceeds from the maturity of a savings bond.
Otherwise, only the interest on the savings bond is taxable, and you should have received Form 1099-INT.
You'll find both these topics under Federal >> Wages & Income in TurboTax.
Additional information from TreasuryDirect: User Guide 265 - Learn More About Tax Reporting
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