As of 2020, Malta was the country with the highest number of parliament members per 100,000 inhabitants. This Southern European country counted 14.3 members in the parliament. By contrast, the Spanish parliament had the lowest number of members in proportion to the population.

In September 2020, a constitutional referendum was held in Italy on the number of parliament members. The Italian Parliament consists of the Chamber of Deputies and Senate of the Republic. The data depicted in the chart show the number of deputies before the referendum, which amounted to 630 members. For every 100,000 individuals, Italy had one deputy, one of the lowest number in the European Union in proportion to country's population. After the referendum, Italy could have just 0.7 members in the Chamber of Deputies per 100,000 population, ranking last in the EU.

Mid-year (30 June) estimates of the usual resident population for Westminster Parliamentary constituencies in England and Wales.

In 2024, 90 of the United Kingdom's 650 Members of Parliament were non-white, 66 of which were members of the Labour Party, while 15 were in the Conservative party, and five non-white MPs were members of the Liberal Democrats.

Abstract copyright UK Data Service and data collection copyright owner.The Audit of Political Engagement is a time-series study providing an annual benchmark to measure political engagement in Great Britain, gauging public opinion about politics and the political system, and more broadly the general health of our democracy. Each Audit report presents the findings from a public opinion survey, providing detailed commentary on a range of measures that have been chosen as key measures of political engagement. Repeating questions in successive years enables us to chronicle the public’s responses year on year and track the direction and magnitude of change since the Audit was first published in 2004, building trend data on public attitudes to key aspects of our democracy. The Audit looks at core inter-locking areas that are known as vital facets, or 'building blocks', of political engagement. Given the multi-dimensional nature of political engagement, the indicators chosen are not exhaustive, but in capturing aspects of public behaviour, knowledge, opinions, attitudes and values towards politics they help us understand the drivers of political engagement and the relationships between them. Across the Audit series several 'core' indicator questions have been asked each year, supplemented by a range of thematic and topical questions, some of which are re-visited on two- or three-year cycles. Further information about the survey series is available from the Hansard Society Audit of Political Engagement webpages. The Audit of Political Engagement 14, 2017 was conducted by Ipsos MORI between 2 December 2016 and 15 January 2017 with a representative quota sample of adults aged 18 and over across Great Britain. Booster samples were included to make comparisons between England, Scotland and Wales, and between the white and black and minority ethnic (BME) populations, more statistically reliable. The data can also be weighted to match the national population profile. The 14th Audit took place after the European Union referendum of 23 June 2016 which was the biggest democratic event that has taken place in the 14-year life of this Audit study and one of the biggest in British electoral history. Main Topics:The core indicators of political engagement covered in every survey aim to discover the percentage of people who:feel they know about politicsare interested in politics;are absolutely certain to vote at an immediate general electionhave undertaken a range of political activitiesbelieve that getting involved in politics is effectivethink that the present system of governing works wellQuestions asked regularly but not every year aim to discover the percentage of people who:are satisfied with MPs in general, with their own MP, with the UK Parliamentagree that the UK Parliament holds government to account, encourages public involvement in politics, is essential to our democracy, debates and makes decision on issues that matter to mefeel involved in local/national decision-makingwant to be involved in local/national decision-making

This polygon shapefile contains Westminster parliamentary constituency boundaries for Great Britain as of 2001. Westminster parliamentary constituencies are the areas used to elect Members of Parliament (MP) to the House of Commons, which is the primary legislative chamber of the UK and is located in Westminster, London. Constituency boundaries are determined by the Boundary Commissions (one each for England, Scotland, Wales and Northern Ireland). The commissions are required to undertake a general review every eight to 12 years to ensure electoral equality – that is, that the sizes of the electorates in each constituency are as similar as possible (currently about 70,000 electors, typically reflecting a total population of 90,000). Constituencies are generally based on whole or part local authority districts unless there is a strong case to straddle boundaries – each case is decided on its merits; constituencies may not, however, split electoral wards/divisions. The Westminster parliamentary constituencies boundaries are based on the fifth Periodical Parliamentary Review that was promulgated in July 2007 (defined in terms of wards as at 12 April 2005). An amending order in July 2008, affected the Welsh Westminster parliamentary constituency boundaries and a further amendment order (operative 18 March 2009) realigning the boundaries for Daventry, South Northamptonshire, Somerton and Frome and Wells has also been applied. Sometimes constituencies are referred to as either borough (burgh in Scotland) or county constituencies. Borough constituencies are predominantly urban whereas county constituencies are partly or mostly rural. There will be no changes for the May 2015 General Election. This layer is part of the Office of National Statistics (ONS) Boundary Dataset supply, 2001-2011.