USCIS published a notice announcing the revision of its Direct Mail Program so that certain filings of Form N-400, Application for Naturalization, will now be filed at a designated lockbox facility instead of a USCIS Service Center.
During the first 30 days after this notice takes affect, USCIS will forward incorrectly addressed Form N-400s to the proper address, rather than reject it. USCIS will forward any improperly addressed Form N-400s covered by this notice as follows:
Any Form N-400 from non-Armed Forces applicants will be forwarded to either the Dallas or Phoenix lockbox facilities.
Any Form N-400 from Armed Forces applicants and the spouses of current members of the Armed Forces will be forwarded to the Nebraska Service Center.
Any applications forwarded within this time period will be considered properly filed when received at either the Dallas or Phoenix lockbox facilities, or the Nebraska Service Center. After this 30-day transition period, any Form N-400 covered by this notice, which is received at a location other than the appropriate location as defined in the updated Form N-400 filing instructions provided in this notice, will be returned with an explanation directing the applicant to mail it to the appropriate processing facility.
Read complete details and filing locations here Download file