Junk Mail
iPhone 6s, iOS 9.3.2
Hey there G-Force22,
Welcome to the Apple Support Communities!
Emptying a junk folder or any mailbox should result in no number showing at all. Let's work together and make that happen! So the junk folder shows "5" messages, yet the folder is empty. Start with these few items:
If the number is still present, check out this resource which has amazing tips and links to other articles that should clear this up for you!
Get help with Mail on your iPhone, iPad, and iPod touch
All the best!
Junk Mail