As of 8 May 2009 there were 580 adults serving a custodial sentence and 78 adults who were either held on remand or were convicted awaiting sentence that have a home address in the North Wales police force area.
These figures include male and female prisoners but do not include young offenders and juveniles. All prisoners are asked for details of their home address on first reception to prison and on discharge from prison. About 60 per cent. of prisoners are shown to have given a recognised address. If no address is given, various proxies are used to determine home location, including next-of-kin address and committal court address.