Several factors can impact where to submit your U.S. Citizenship application. The first factor is how you apply. You can apply for U.S. citizenship two ways:

You can submit USCIS Form N-400, Application for Naturalization.
Or you can file file online through the USCIS portal. You can find out more about that here.

Filing USCIS form N-400 by mail

If you file using the N-400 form, you'll need to mail the form directly to a USCIS lockbox facility. The address where you should mail your application varies by where you live. Below you'll find the corresponding lockbox facility where you should mail your N-400 application. Keep in mind that applications not submitted to the appropriate facility could experience processing delays or potentially be lost.

N-400 Filing Address for non U.S. military

If you live in:	Mail your form to:
Connecticut Delaware District of Columbia Florida Georgia Maine Maryland Massachusetts New Hampshire New Jersey New York North Carolina Pennsylvania Rhode Island South Carolina Vermont Virginia West Virginia	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
Alabama Alaska American Samoa Arizona Armed Forces Americas Armed Forces Europe Armed Forces Pacific California Colorado Commonwealth of the Northern Mariana Islands Guam Hawaii Idaho Kansas Kentucky Marshall Islands Micronesia Minnesota Mississippi Montana Nebraska Nevada New Mexico North Dakota Oregon Palau Puerto Rico South Dakota Tennessee U.S. Virgin Islands Utah Washington Wyoming	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) 1820 E. Skyharbor Circle S Suite 100 Phoenix, AZ 85034-4850
Arkansas Louisiana Oklahoma Texas	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
Illinois Indiana Iowa Michigan Missouri Ohio Wisconsin	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

N-400 Filing address for 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 advance parole document at the same time you file your Form N-400	See the “Advance Parole Document for current and former service members outside of the U.S.” section of our Direct Filing Addresses for Form I-131, Application for Travel Document page.

After submitting your Form N-400 by mail, USCIS will mail you an Account Acceptance Notice with instructions on how to create a USCIS online account. This will help you to track and manage your case.