Nope, there's 7. Room Numbers should be 104, 105, 107, 110, 116 and 118. Also, pay attention to Room 111 with some nightvision cameras at around 3am when you have time to kill.
The 7th girl is a secret. You get quite a few hints as to what she may be in all the stuff you find and put in the lost and found and you'll need to use the Ouija board once you catch wind of her.
