Use IRS Form W-7 to apply
for a Taxpayer Identifying Number. A copy is here: http://www.irs.gov/pub/irs-pdf/fw7.pdf . Instructions here: https://www.irs.gov/pub/irs-pdf/iw7.pdf
The W-7 is mailed to:
Internal Revenue Service
Austin Service Center
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
Also: "You may also apply using the services of an IRS-authorized
Acceptance Agent or visit an IRS Taxpayer Assistance Center in lieu of mailing
your information to the IRS in Austin. TACs in the United States provide
in-person help with ITIN applications on a walk-in or appointment basis.
Applicants outside the United States should contact an overseas IRS office to
find out if that office accepts Form W-7 applications. The IRS's ITIN Unit in
Austin issues all numbers by mail."
