HI,
I want to send my N-400 application using USPS Certified Mail.
Should I then send it to:
USCIS
P.O. Box 660060
Dallas, TX 75266
Or for the express/courier delivery?
USCIS
Attn: N-400
2501 S. State Hwy 121 Business
Suite 400
Lewisville, TX 75067
Thanks!