Update to Form N-600, Application for Certificate of Citizenship
12/23/16. Starting 02/21/17, USCIS will only accept the 12/23/16 edition. Until then, you can use previous editions. However, all filings postmarked 12/23/16 or later must include the new fees or we will reject them. You can find the edition date at the bottom of the page on the Form and Instructions.