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 could disrupt Friday ferry crossings
Two of the Steam Packet's crossings this Friday are at risk because of bad weather.
Nodding Santa returns to Ramsey!
A much-loved feature of Ramsey's Christmas celebrations has returned, after worries about his fate last year.
Southerners being invited to 20mph drop-in session
Infrastructure Minister Michelle Haywood is to host a drop-in session about proposed 20mph speed limits next week.
Bus driver strike ballot closes today
Bus drivers have until the end of today to decide if they back taking strike action.
High School reprimanded over data protection practices
An Island high school has been given a reprimand by the Information Commissioner over its data protection practices.
Met Office issues yellow weather warning
A yellow weather warning has been issued for coastal overtopping overnight.
MHK: Removing bishop's Tynwald vote would 'end 1,000 years of history'
An Onchan MHK is urging people to contact their Tynwald members over moves to strip the bishop of their parliamentary vote.
Pest problems force changes to Ramsey hospital services
Manx Care says a number of services will move out of Ramsey Cottage Hospital as it deals with a pest control issue.
