Her Majesty's Young Offender Institution

Her Majesty's Young Offender Institution (or HMYOI) is a type of British prison intended for offenders aged between 18 and 20. There are as of 2005 13 dedicated institutions:

HMYOI Aylesbury
HMYOI Deerbolt
HMYOI Huntercombe
HMYOI Lancaster Farms
HMYOI Northallerton
HMYOI Onley
HMYOI Portland
HMYOI Rochester
HMYOI Stoke Heath
HMYOI Swinfen Hall
HMYOI Thorn Cross
HMYOI Werrington
HMYOI Wetherby

and 20 which share their site with other penal establishments:

HMP & YOI Askham Grange
HMP & YOI Brinsford
HMP & YOI Brockhill
HMP & YOI Bullwood Hall
HMP & YOI Castington
HMP & YOI Chelmsford
HMP & YOI Durham
HMP & YOI East Sutton Park
HMP & YOI Feltham
HMP & YOI Guys Marsh
HMP & YOI Hindley
HMP & YOI Hollesley Bay
HMP & YOI Low Newton
HMP & YOI Moorland
HMP & YOI New Hall
HMP & YOI Norwich
HMP & YOI Reading
HMP & YOI Warren Hill
HMP/RC & YOI Exeter
HMYOI & RC Glen Parva

See Young Offender Institution, Her Majesty's Prison Service