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  4. Direct Filing Addresses for Form N-400, Application for Naturalization

Direct Filing Addresses for Form N-400, Application for Naturalization

Alert Type info

Alert: Before sending your package to USCIS, make sure that all the forms you have completed are the current acceptable edition. The current acceptable edition can be found under the Edition Date section listed on each form’s webpage.

You can also find the edition date at the bottom of the page on the form and instructions. For each form that you are submitting, make sure that all pages are from the same form edition. If any of the form’s pages are from a different form edition, we may reject your form. Watch USCIS Forms: Download the most recent version! to see how to ensure your form is acceptable.

For additional guidance on filing paper-based forms at the Lockbox and how to avoid or correct common errors before you file, please visit the Five Steps to File at the USCIS Lockbox webpage.

When you submit Form N-400 on paper, we will mail you a USCIS Account Acceptance Notice with instructions on how to create an online account to track and manage your case. We will process your application even if you do not create an online account, but we encourage you to create and access your online account. We will continue to mail you copies of notifications about your case.

Current or Former Members of the Military and Their Dependents
If you are applying based on:Mail your form to:
  • Being a current or former member of the military;
  • Being a spouse of a current member of the military; or
  • Being a spouse, parent or child of a deceased member of the military

USCIS Chicago Lockbox

U.S. Postal Service (USPS):

USCIS
Attn: Military N-400
P.O. Box 4446
Chicago, IL 60680-4446

FedEx, UPS, or DHL deliveries:

USCIS
Attn: Military N-400 (Box 4446)
131 S. Dearborn, 3rd Floor
Chicago, IL 60603-5517

  • Being a current or former service member residing outside of the United States and you are applying for an initial parole document at the same time you file your Form N-400
See the “Initial Parole Document (for aliens who are currently outside the United States)” section of our  page.
All Other Applicants
If you live in:Mail your form to:
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USCIS Elgin Lockbox

U.S. Postal Service (USPS): 

USCIS
Attn: N-400  
P.O. Box 4060
Carol Stream, IL  60197-4060

FedEx, UPS, and DHL deliveries: 

USCIS 
Attn: N-400 (Box 4060)
2500 Westfield Drive 
Elgin, IL 60124-7836

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USCIS Phoenix Lockbox

U.S. Postal Service (USPS):

USCIS
Attn: N-400
P.O. Box 21251
Phoenix, AZ 85036-1251

FedEx, UPS, and DHL deliveries:

USCIS
Attn: N-400 (Box 21251)
2108 E. Elliot Rd.
​​​​​​​Tempe, AZ 85284-1806

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USCIS Dallas Lockbox

U.S. Postal Service (USPS):

USCIS
Attn: N-400
P.O. Box 660060
Dallas, TX 75266-0060

FedEx, UPS, and DHL deliveries:

USCIS
Attn: N-400 (Box 660060)
2501 S State Hwy 121 Business
Suite 400
Lewisville, TX 75067-8003

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USCIS Chicago Lockbox

U.S. Postal Service (USPS):

USCIS
Attn: N-400
P.O. Box 4380
Chicago, IL 60680-4380

FedEx, UPS, and DHL deliveries:

USCIS
Attn: N-400 (Box 4380)
131 S. Dearborn, 3rd Floor
Chicago, IL 60603-5517

 

Last Reviewed/Updated:
01/24/2025
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