The Department of Home Affairs says the prison has almost 15 per cent more inmates than it was designed for.
A Freedom of Information request asked how many prisoners the Jurby facility was designed to hold, and how many people were currently incarcerated there.
In its response, the department said the official capacity was 141 - and on April 7 there were 159 inmates.
It added there were 26 cabins on top of the permanent accommodation, all of which were being used.
Weather postpones council's Easter fun day
Douglas Council says it's had to postpone an event in one of its parks this week because of bad weather.
Seven ferry crossings hit by water levels and dredging issues in Douglas
The Steam Packet company has rescheduled seven ferry sailings this week.
Sam Barks returns to Les Mis in transatlatic tour
Manx actress Samantha Barks is returning to the stage to reprise one of her most famous film roles.
DHSC commissioning rapid review of Noble's bed capacity
The Department of Health and Social Care is commissioning a rapid review of bed capacity at Noble's Hospital.
Progress being made on landmark's new building
A new ticket office at an Island landmark is taking shape!
Temporary traffic lights on TT course section
Essential maintenance work will mean temporary traffic lights on the TT course in the north of the Island tomorrow.
All government departments but one within budget
The government says most of its departments are expected to finish the year within their budget, except for one.
Unclaimed Manx lottery ticket worth £125,000 - is it you?!
Could you be sitting on more than £125,000 after winning it in the National Lottery?
