• Fax Number: 540-710-2763 OR 540-710-2783 • Mailed via U.S. Postal service (note: Registered Mail is accepted) to: Transportation Security Administration TSA TWIC Processing Center P.O. Box 8118 Fredericksburg, VA 22404-8118 Please remember to include the cover sheet (that was provided with your letter from TSA) and all supporting documentation when faxing or mailing your material.