If your return is still in progress, you can change the zip code by visiting the Personal Info section of TurboTax Free Edition online. Scroll down to the mailing address section, click edit and change the zip code information.
If your return has been efiled and accepted, you are unable to
make any changes because the return is already being processed. You may
want to call the IRS and inform them of the zip code change in a couple
weeks once your return is fully processed by filing IRS form 8822. The IRS contact phone number is 1-800-829-1040.
https://ttlc.intuit.com/replies/3301581
