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Dewis pwnc arall neu clirio pob hidlydd.
Nid yw holl gynnwys y cyfrifia wedi'i ryddhau. Edrychwch am ddatganiadau sydd i ddod ar y calendr datganiadau. Fel arall, gallwch greu set ddata eich fun.
Rhyddhawyd ar: 10 March 2025 | Gwybodaeth gorfforaethol
Rhyddhawyd ar: 15 July 2025 | Gwybodaeth gorfforaethol
Rhyddhawyd ar: 8 August 2025 | Gwybodaeth gorfforaethol
Access to the parental permission form (if required) and the questionnaire - you will need to enter the access code from your letter to begin.
Rhyddhawyd ar: 4 February 2025 | Gwybodaeth gorfforaethol
Taking part in an ONS Survey? It starts with you! Find out why our surveys are so important and how we keep your information safe and secure.
Rhyddhawyd ar: 28 June 2017 | Gwybodaeth gorfforaethol
An assessment of the Valuation Office Agency (VOA) dataset as a potential for replacing the questions on number of rooms and bedrooms on the 2021 Census.
Rhyddhawyd ar: 21 January 2026 | Gwybodaeth gorfforaethol
Rhyddhawyd ar: 30 April 2025 | Gwybodaeth gorfforaethol
Rhyddhawyd ar: 4 February 2015 | Gwybodaeth gorfforaethol
Rhyddhawyd ar: 9 October 2025 | Gwybodaeth gorfforaethol
Rhyddhawyd ar: 31 July 2020 | Methodoleg
Summary of the quality assurance undertaken on administrative data for Valuation Office Agency property attribute data used in Census 2021.
