Citizenship and Naturalization Forms (USCIS)View all Citizenship and Naturalization forms on the U.S. Citizenship and Immigration Services (USCIS) website. Contains the capability to search all USCIS forms. File your form online for a more convenient and secure experience. For forms available only in paper, select the Form Details button to download the form and instructions. USCIS forms and USCIS online accounts are always free.