Per IRS, you should mail your application to:
Internal Revenue Service
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
See the IRS link https://www.irs.gov/instructions/iw7
You should call the IRS to verify if they received your package. You can call the IRS toll-free at 800-829-1040 if you are in the United States or 267-941-1000 (not a toll-free number) if you are outside the United States. This service allows you to check the status of your application seven weeks after submitting Form W-7 and your tax return.
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