Citizenship Process Articles - FAQs How long does it take to become a U.S. citizen after filing my application for naturalization? What do I need to send to the INS to complete my application for a visa or for U.S. citizenship? What is the best way to contact United States Citizenship and Immigration Services (USCIS)? What is the fee for Form N-400, the application for U.S. citizenship? What is the process for U.S. citizenship if I meet all of the requirements? Where do I go to get fingerprinted for my application for permanent legal residence in the U.S.? Which INS form(s) will I need to apply for citizenship in the United States?