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.
Yellow weather warning issued over snow and ice tonight
Ronaldsway Met Office has put out a yellow weather warning about freezing conditions tonight.
Steam Packet carried 680,000 passengers last year
The Steam Packet Company says it carried more than 680,000 passengers on its vessels last year - up more than eight per cent on 2024's tally.
Roof work to shut Castletown shopping street
A street in Castletown's centre will close to traffic next week for emergency work.
Church unveils plans to modernise facilities
A church in Onchan has applied for permission to upgrade its facilities for what it says are "evolving needs".
Are Mountain Road closures harming Ramsey?
A business in Ramsey is calling for ideas, saying a rising number of Mountain Road closures is hurting the town.
No whey! Creamery says goodbye to much-loved butter
The Isle of Man Creamery says they're discontinuing its 250g block of whey butter.
Roofing Outlaw plans Isle of Man franchise
A self-style outlaw roofer from the UK says he's hoping to open a branch of his business on the Isle of Man.
Can you help find fly-tippers?
A local authority in the west of the Island is appealing for information after a fly-tipping incident at a local beauty spot.
