USCIS is enhancing the filing process for certain naturalization and citizenship forms. To begin with, USCIS has brought about changes in the filing locations for four of the N-Forms – N-300, N-336, N-600 and N-600K.
Beginning Oct 30, 2011 all N-300, N-336, N-600 and N-600K forms have to be submitted to the appropriate Lockbox. And until Dec 02, 2011, local USCIS offices will forward the applications they receive to the Lockbox. However, after Dec 02, 2011 the application will be returned to the sender with instructions on how to re-file at the appropriate Lockbox facility.
Form N-400, Application for Citizenship is already being filed at a Lockbox facility. Forms N-336, N-600 and N-600K applications will go to the Phoenix Lockbox facility while Form N-300 applications will go to the Dallas Lockbox facility.
USCIS has updated this information on their website. Make certain you take note of these changes and prevent processing delays of you application. As always, you should always make sure they are using the right form, reflecting their need. And again, make certain that the application is filed at the right address. Using the wrong form will result in the rejection of your application and refunds will not be issued. This would mean that you have to reapply using the correct form and pay another fee for that particular application.