Your mailing address should be the address you want the IRS to use if they have to send you a letter or check. But in the Personal Info section of TurboTax, be sure to enter "Foreign or U.S. Possession" as your State of Residence. (It's the last choice in the State of Residence drop-down window.)
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
