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