What documents do I need to apply for U.S. citizenship?
If you are eligible to apply for U.S. citizenship (naturalization), you will need to submit a combination of forms, documents, two passport-style photographs, and a fee. (To see whether you are eligible to naturalize, read the related articles under "U.S. Citizenship Through Naturalization.")
The form that you must submit to U.S. Citizenship and Immigration Services (USCIS) is called Form N-400. Along with the completed Form N-400 you must submit the following:
USCIS may request further documents. If you fail to provide the requested documents, your application can be denied. An experienced US immigration attorney can advise you on the required documents.
More information about formatting options