If you want to obtain US citizenship through  naturalization, please see USCIS Policy Manual Citizenship and Naturalization Guidance.

To apply for naturalization, you need to file Form N-400, Application for Naturalization.

The USCIS provides educational materials to help you prepare for the English, U.S. history and civics portions of the naturalization test, including:

• Naturalization Self Test
• Study for the Naturalization Test

For more test information visit the USCIS Naturalization Test page.

If you are in the military and are interested in becoming a U.S. citizen, please see USCIS Naturalization Through Military Service page.

You May Qualify for Naturalization if:

• You have been a permanent resident for at least 5 years and meet all other eligibility requirements, please visit the USCIS Path to Citizenship page for more information.
• You have been a permanent resident for 3 years or more and meet all eligibility requirements to file as a spouse of a U.S. citizen, please visit the USCIS Naturalization for Spouses of U.S. Citizens page for more information.
• You have qualifying service in the U.S. armed forces and meet all other eligibility requirements. Visit the Military section of USCIS website.
• Your child may qualify for naturalization if you are a U.S. citizen, the child was born outside the U.S., the child is currently residing outside the U.S., and all other eligibility requirements are met. Visit the USCIS Citizenship Through Parents page for more information.

You may qualify through other paths to naturalization if you do not qualify through the paths described in the links to the left. See also the USCIS Policy Manual Citizenship and Naturalization Guidance and USCIS  A Guide to Naturalization (PDF, 1.01 MB) guide. Chapter 4 of the guide discusses who is eligible for naturalization.

Note: You may already be a U.S. citizen and not need to apply for naturalization if your biological or adoptive parent(s) became a U.S. citizen before you reached the age of 18. For more information, visit the USCIS Citizenship Through Parents page.