Philadelphia Immigration Lawyer Blog

The USCIS announced on December 17, 2009 that all applications for Naturalization (Form N-400) are to be filed at new USCIS Lockbox facilities in Phoenix and Dallas and that the change in filing address takes effect immediately.

N-400 naturalization applicants who live 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, Tennesee, Texas, Vermont, Virginia, West Virginia, Puerto Rico, or the U.S. Virgin Islands file their N-400 applications by regular mail with the USCIS Dallas Lockbox at

USCIS
P.O. Box 660060
Dallas, TX 75266

Express Mail and Courier deliveries (which I highly recommend) must send their N-400 application to:

USCIS
ATTN: N-400
2501 S. State Hwy. 121 Business
Suite 400
Lewisville, TX 75067

N-400 naturalization applicants who live 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 file their N-400 applications by regular mail with the USCIS Phoenix Lockbox at:

USCIS
PO Box 21251
Phoenix, AZ 85036

For Express Mail and Courier deliveries the N-400 must be sent to:

USCIS
ATTN: N-400
1820 E. Skyharbor Circle S
Suite 100
Phoenix, AZ 85034