Most IRS addresses are PO Boxes that do not have a telephone number. Courier services cannot deliver to a PO Box and must have a phone number.
A long search online finally revealed an address referenced in several places:
Internal Revenue Service
3651 S.IH 35
Austin, Texas 78741
United States of America
Note: “S.IH 35” stands for “South Interregional Highway 35”
Use the following address to send your Form TD F 90.22-1 – Foreign Bank Account Filing Requirement:
IRS Enterprise Computing Center
ATTN: CTR Operations Mailroom, 4th Floor
985 Michigan Avenue
Detroit, MI 48226
Delivery messenger service contact telephone number: 313-234-1062
Many expatriate US citizens must struggle to find these addresses each year, so I paste it here as a public service.
If anyone has better information, please leave a comment for your fellow “Official US Taxpayers”!
Disclaimer: I take no responsibility for the ongoing accuracy of this address and phone number. Use at your own risk and peril.