What Is the Purpose of This Form?
Who Should Not Use This Form?
Form N-400 is an application for U.S. citizenship
(naturalization). For more information about the
naturalization process and eligibility requirements,
please read A Guide to Naturalization (M-476). If
you do not already have a copy of the Guide, you can
get a copy from:
In certain cases, a person who was born outside of the
United States to U.S. citizen parents is already a
citizen and does not need to apply for naturalization.
To find out more information about this type of
citizenship and whether you should file a Form N-600,
''Application for Certificate of Citizenship,'' read the
The USCIS website (www.uscis.gov);
Other permanent residents under 18 years of age may
be eligible for U.S. citizenship if their U.S. citizen
parent or parents file a Form N-600 application in their
behalf. For more information, see ''Frequently Asked
Questions'' in the Guide.
The USCIS toll-free forms line at
Who Should Use This Form?
To use this form you must be ONE of the following:
(1) A Lawful Permanent Resident for at least five
years and at least 18 years old;
(2) A Lawful Permanent Resident for at least three
years and at least 18 years old,
You have been married to and living with the
same U.S. citizen for the last three years,
Your spouse has been a U.S. citizen for the
last three years;
You served honorably as a member of the
Selected Reserve of the Ready Reserve or in
active-duty status during a designated period of
hostilities. You then may apply for
naturalization without having been physically
present in the United States for any specified
Department of Homeland Security
U.S. Citizenship and Immigration Services
(3) A member of one of several other groups eligible
to apply for naturalization (for example, persons who
are nationals but not citizens of the United States) and
at least 18 years old. For more information about these
groups, please see the Guide.