House of Commons Library

UK Prison Population Statistics

Published Monday, July 23, 2018

This briefing paper explores prison population data for the UK from the Ministry of Justice, Scottish Government, and the Northern Ireland Department of Justice.

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This briefing paper explores data on the UK prison population, including the population size and change over time, the demographic profile of prisoners, safety in prisons, and the cost per prisoner.

Prisons are a devolved, so UK prison statistics are published separately for England and Wales (the Ministry of Justice), Scotland (the Scottish Government), and Northern Ireland (the Department of Justice). This briefing also compares the UK with other countries.

Weekly prison population data are available for England, Wales and Scotland and quarterly data are available for Northern Ireland. The latest available data show a current prison population of approximately 92,500, comprising

  • 83,430 in England and Wales (end of May 2018)
  • 7,595 in Scotland (end of June 2018)
  • 1,475 in Northern Ireland (end of March 2018)

The prison population of England & Wales quadrupled in size between 1900 and 2017, with around half of this increase taking place since 1990.  The Scottish prison population almost doubled in size since 1900 and rose 60% since 1990. The data series for Northern Ireland begins in 2000. Between 2000 and 2016/17 the prison population of Northern Ireland increased by 38%, although the prison population is currently at its lowest since 2010.


 To put the prison population in context, it is possible to calculate the number of prisoners per 100,000 people in the general population. At the most recent count there were:

  • 179 prisoners per 100,000 of the population in England and Wales in 2017
  • 166 per 100,000 in Scotland (2016/17) and
  • 98 per 100,000 in Northern Ireland (2016/17).

International comparisons by Eurostat indicate that, in 2015, England and Wales has the 8th highest rate among EU countries and the highest amongst western European jurisdictions.

The availability of more detailed data on the prison population varies by jurisdiction. Where available, this briefing contains statistics on:

  • Sentence length and offences for which prisoners were convicted
  • Age of prisoners
  • Nationality
  • Ethnicity and religion
  • Over-crowding
  • Safety in prisons (assault, self-harming, deaths in prison, drugs)
  • Prisoner escapes and absconds
  • Cost per prisoner

An Excel spreadsheet is also provided which contains the underlying data to the charts in the briefing.


Commons Briefing papers SN04334

Author: Georgina Sturge

Topic: Prisons

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