How many are there to a dormitory in Hogwarts?

There's no single number for how many students are in a Hogwarts dormitory. The books and films don't give exact figures, and the number likely varied across years and houses. However, we know there are multiple students per dormitory, and a significant number of students at Hogwarts overall. We can infer that each dormitory likely housed between a dozen and several dozen students, depending on the year level.