2021 United Kingdom census
2021–22 census of the population of the UK
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| 2024 | Evaluation and future planning phase of the census work programme continues. |
| September 2024 | OSR removed official accreditation of gender identity statistics, reclassifying them as 'official statistics in development'. |
| May 21 2024 | Planned release of first detailed census results, including population estimates at output areas and topical data about ethnic group, national identity, language, and religion. |
| 2023 | Continuation of analysis, output, and dissemination phase. |
| 2023 | Evaluation and future planning phase begins. |
| September 2023 | Office for Statistics Regulation (OSR) reported initial findings questioning the quality assurance of gender identity data collection. |
| September 14 2023 | Initial census results for Scotland were released by National Records of Scotland, after missing the original March 2023 deadline. |
| April 2023 | Detailed data analysis by Professor Michael Biggs raised concerns about potential anomalies in transgender identification statistics. |
| March 2023 | Northern Ireland Statistics and Research Agency published census results for Northern Ireland in Spring 2023 |
| January 6 2023 | Sexual orientation and gender identity census results released, with 89.4% identifying as straight/heterosexual, 1.5% as gay or lesbian, and 1.3% as bisexual. |
| 2022 | Census for Scotland conducted, with initial turnout rates of 79% and an extended return period raising the rate to 89%. |
| November 29 2022 | Census results on religion published, revealing that 46.2% identified as Christian, 6.5% as Muslim, 1.7% as Hindu, and 37.2% declared 'no religion'. |
| June 28 2022 | Initial census results for England and Wales were released by the Office for National Statistics. |
| March 20 2022 | Census conducted in Scotland, delayed from the original 2021 date due to the COVID-19 pandemic. |
| February 17 2022 | Lord Sandison dismissed Fair Play for Women's judicial review case, ruling that there was no legal requirement to answer the sex question solely based on birth certificate or Gender Recognition Certificate. |
| 2021 | The Isle of Man undertook a full census, following an interim census in 2016. |
| 2021 | Jersey conducted a census on the same day as the United Kingdom census, despite being a Crown Dependency and not part of the UK. |
| 2021 | Administrative data trials continued through 2021. |
| 2021 | Target set to have at least 65% of census forms completed online, with support provided for those unable to complete the census electronically. |
| December 2021 | Collection operations phase of the census work programme concluded in December 2021. |
| December 2021 | Fair Play for Women filed a judicial review in Scotland challenging the census sex identification guidelines. |
| November 2021 | Murray Blackburn Mackenzie policy collective claimed that the Equality and Human Rights Commission exerted significant external pressure on Scottish civil servants regarding census guidance. |
| August 2021 | National Records of Scotland issued guidelines for the 2022 Scottish census, stating that transgender individuals could answer the sex question differently from their birth certificate without requiring a Gender Recognition Certificate. |
| March 2021 | Fair Play for Women applied for a judicial review in England and Wales challenging the Office for National Statistics' guidance on census sex identification, arguing against self-identification in census-taking. |
| March 21 2021 | Original scheduled date for the 2021 Scotland census before being delayed. |
| March 21 2021 | Census day, when all residents who had lived or intended to live in the UK for three months or more were legally required to complete a census questionnaire. |
| March 21 2021 | Census conducted for England, Wales, and Northern Ireland, marking the first British census where most data was gathered online, taking place during the COVID-19 pandemic. |
| January 2021 | M&C Saatchi launched an advertising campaign for the UK census with the slogan 'it's about us', featuring television adverts showcasing a diverse range of people from England and Wales against a purple fabric screen. |
| July 2020 | Scottish Government delayed the census originally scheduled for 21 March 2021 due to the COVID-19 pandemic. |
| July 2020 | Collection operations phase of the census work programme began in July 2020. |
| June 2020 | Census rehearsal phase concluded in June 2020. |
| 2019 | The Census (Amendment) (Scotland) Act 2019 was passed, allowing voluntary questions about transgender status and sexual orientation in the Scottish census. |
| 2019 | The Census (Return Particulars and Removal of Penalties) Act 2019 was passed for England and Wales, enabling voluntary sexual orientation questions in the census. |
| October 7 2019 | National Records of Scotland conducted a census rehearsal in parts of Glasgow City, Dumfries and Galloway, and Na h-Eileanan Siar, closing for returns on 7 November 2019. |
| January 2019 | Census rehearsal phase began in January 2019. |
| 2018 | Development phase of the census work programme took place. |
| 2017 | Testing phase of the census work programme was conducted. |
| 2017 | UK Statistics Authority was due to complete commissioned research strands for the 2021 census operation and future population statistics. |
| December 2016 | Design and prototyping phase of the census work programme ended in December 2016. |
| August 2016 | Leidos merged with Lockheed Martin's IT sector, forming the parent company of Leidos Innovations UK, which would later be involved in the 2021 UK Census contract. |
| 2015 | Late 2015 was the earliest point when census regulations could potentially be made under the legislative process for the UK census. |
| September 2015 | Trials of statistics generation using administrative data began in autumn 2015. |
| March 2015 | Research phase of the UK census work programme concluded in March 2015. |
| 2014 | UK Statistics Authority recommends a decennial-style 2021 census for England and Wales, primarily to be conducted online with supplementary administrative and survey data |
| July 2014 | Minister for the Cabinet Office supports a predominantly online 2021 census, viewing it as a transitional approach to future data gathering methods |
| April 2014 | British House of Commons Public Accounts Committee recommends proceeding with the 2021 census and calls for investigation into administrative data usage |
| 2011 | NISRA published a review report of the previous census, analyzing online census approaches and identifying key strategies for future census implementation. |
| 2011 | Lockheed Martin UK was initially awarded the census contract for the upcoming 2021 census. |
| 2011 | First UK census to include the option of completing documentation online, with 15-19% of forms submitted electronically across the UK. |
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