Form I-140 filed alone or together with an Application to Register Permanent Residence or Adjust Status (Form I-485) should be filed at the USCIS Dallas Lockbox facility, or at the USCIS Nebraska or Texas Service Centers, depending on the classification for which the petition is being filed. Forms I-140 for skilled workers (marked “f” in Part 2, Petition Type, of the form) should continue to be submitted to either the Nebraska or to the Texas Service Centers. Forms I-140 that are accompanied by a Form I-907, Request for Premium Processing Service should also go only to the Nebraska or Texas Service Centers. Beginning on Aug. 3, 2010 all other Form I-140s should be submitted to the USCIS Dallas Lockbox facility. Detailed guidance can be found in the updated Form I-140 instructions on the USCIS website at www.uscis.gov.