Home » FAQ » Citizenship for Green Card HoldersCitizenship for Green Card Holders posted in: FAQ, U.S. Citizenship Questions | 0 How to become a U.S. citizen if I already have a green card? Where should I submit my citizenship application? How long does it takes the process of the citizenship application? For how many years do I need to have my green card before applying for my citizenship? What is the difference between a U.S. lawful permanent resident with a green card and a U.S. citizen?