Number of students - new information

[Blaise]

No: HPFGUIDX 27533

The Leaky Cauldron has a link to the front pages of 'Premier' 
magazine.  One of these is a collection of Hogwarts facts and 
figures.  It says that there are 400 students.  Other figures are: 

The Hogwarts Library closes at 8pm.
There are 278 days in a school year.
142 staircases in Hogwarts.
Dragons outlawed in 1709.
  
The link: http://www.thespellbinder.com/culture/premiere/fun.html

I have no idea whether this is official from JKR, but it might 
breathe new life into the old question of how many students there are.

Blaise.