Beginning Aug. 3, 2010 all Form I-129F petitions being filed by a U.S. citizen on behalf of a fiancé(e)  or spouse must be submitted to the USCIS Dallas Lockbox facility. For U.S. Postal Service: USCIS PO Box 660151 Dallas, TX 75266 For Express mail and courier deliveries: USCIS Attn: I-129F 2501 South State Highway 121 [...]