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.
TT legacy lap signups open soon
Bikers will soon get their annual chance to take part in the legacy lap of the TT course.
Benefits claims move online
People can now make applications and claims for income support online.
Steam Packet lifeboat to return to Dunkirk for commemorations
A 1930s Steam Packet lifeboat will return to Dunkirk to mark the 85th anniversary of the wartime evacuation.
Around 30 complaints a month made about Manx Care
More than 30 complaints a month have been received by Manx Care during the past three years.
Auction house planning special TT sale
Do you have any special TT items you think collectors might snap up?
No fresh Summerland inquests, says AG
There'll be no new inquests for the victims of the Summerland fire, after the Island's Attorney General declined an application.
Cruise ship due in Douglas today
A cruise ship carrying up to 264 passengers is due to visit the Island today.
Fire service pays tribute to firefighters killed in UK blaze
The Island's Fire and Rescue Service is paying tribute to two firefighters who lost their lives in the UK this week.
