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FORM N-400

Form N-400

Application for Naturalization

Use this form to apply for United States Citizenship.

Filling Fee


(An additional fee for fingerprinting may be required, Fees are accepted in the form of money order, personal check or cashier's check only.)

Download Free US Immigration Forms

Edition Date


(No previous editions accepted.)

Download Free and Fillable INS Forms Online

Number of Pages

21 Pages + Instructions

Download DOL and Department of State Forms


If you currently reside in Alaska, Arizona, California, Colorado, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada, North Dakota, Ohio, Oregon, South Dakota, Utah, Washington, Wisconsin, Wyoming, Territory of Guam, or the Commonwealth of Northern Mariana Islands, send your application to the USCIS Lockbox Facility at:

USCIS Phoenix Lockbox

U.S. Postal Service deliveries:

P.O. Box 21251,
Phoenix, AZ 85036

Express Mail and Courier deliveries:

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

Yes, I would like to check my US visa eligibility

If you reside in Alabama, Arkansas, Connecticut, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Mississippi, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, Vermont, Virginia, West Virginia, Puerto Rico, or the U.S. Virgin Islands, send your application to the USCIS Lockbox Facility at:

USCIS Dallas Lockbox


U.S. Postal Service deliveries:

P.O. Box 660060
Dallas, TX 75266

Express Mail and Courier deliveries:

Attn: N-400
2501 S State Hwy 121,
Suite 400,
Lewisville, TX 75067


All naturalization applicants filing under the military provisions, section 328 or 329, should file their application at the Nebraska Service Center regardless of geographic location or jurisdiction. Please send your application to:

Nebraska Service Center
P.O. Box 87426
Lincoln, NE 68501-7426

Express Mail and Courier deliveries:

Nebraska Service Center
850 S Street
Lincoln, NE 68508

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