A United States citizenship application is filed on USCIS form N-400 (Application for Naturalization) by mailing the completed forms and required documents to one of two lock box facilities, based upon the applicant’s state of residence. After the citizenship application is processed, the local USCIS office will schedule a citizenship interview and complete the naturalization process. Citizenship application processing times will vary by local office.

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Arizona

USCIS
P.O. Box 21251
Phoenix, AZ 85036

Express/Courier:
USCIS
Attn: N-400
1820 E Skyharbor Circle S
Suite 100
Phoenix, AZ 85034

Texas

USCIS
P.O. Box 660060
Dallas, TX 75266

Express/Courier:
USCIS
Attn: N-400
2501 S State Hwy 121
Suite 400
Lewisville, TX 75067

Military Applications
If filing from N-400 under INA 328 or INA 329, file at the Nebraska Service Center regardless of where you reside:
Nebraska Service Center
P.O. Box 87426,
Lincoln NE 68501-7426

Updated: 10/13/10