Home | Adjustment Of Status | About Us Make sure your cover letter has the correct address, and that you are mailing your I-129F packet to the correct address. Download I-129F Cover Letter For U.S. Postal Service (USPS): USCIS P.O. Box 660151 Dallas, TX 75266 For FedEx, UPS, and DHL deliveries: USCIS Attn: I-129F 2501 South State Highway 121 Business Suite 400 Lewisville, TX 75067 Be sure to replace the items in red with your information. Both letters require signatures Download Intent To Marry Letters