N400 Mailing Address

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N400 Mailing Address

N400 Mailing Address is, USCIS, Attn: N-400, P.O. Box 660060, Dallas, TX 75266-0060.

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

Mailing Address for Current or Former Members of the Military and Their Dependents

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

Mailing Address for

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

  • 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

Mailing Address for

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

  • 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

Mailing Address for 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

Mailing Address for Illinois, Indiana, Iowa, Michigan, Missouri, Ohio, Wisconsin

USCIS Chicago Lockbox

  • 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

Source: USCIS