The jail was designed to hold 318 inmates but the Howard League for Penal Reform says at the end of January, there were 530.
The charity also says the overcrowding leads to more violence and self-harm among prisoners, and hampers their rehabilitation.
Young voices barely registered in devolution consultation
Only eight people under the age of 24 registered a view
Energetic Pretty Woman is a must-see
REVIEW: Pretty Woman The Musical
Devoncast - Police and Crime Commissioner election special
Devoncast is back with the latest from around the county
New pledge on South Hams Freeport funding
'It is taxpayers’ money, but that money is being spent in the South Hams'
Axminster children connect with space station
Space cadets link live with astronaut
East Devon should get new CEO
Local Government Association recommends new boss
