{"id":"82d9faea-b515-41cd-aedb-8f4594f66ce5","first_published_at":"2025-09-25T16:00:00.000Z","dimensions":[{"id":"ce719609-5c27-493c-beab-6d9e1c0d5f81","type":"lookup_table","factTableColumn":"AgeCode","isSliceDimension":false,"metadata":[{"language":"en-GB","name":"Age"},{"language":"cy-GB","name":"Oedran"}]},{"id":"068ba890-9bfd-4f47-b425-55c31b691bfa","type":"lookup_table","factTableColumn":"SexCode","isSliceDimension":false,"metadata":[{"language":"cy-GB","name":"Rhyw"},{"language":"en-GB","name":"Sex"}]},{"id":"e3273e41-663b-4d25-aee6-e93a6c685fef","type":"lookup_table","factTableColumn":"AreaCode","isSliceDimension":false,"metadata":[{"language":"cy-GB","name":"Ardal"},{"language":"en-GB","name":"Area"}]},{"id":"7faa74ee-287a-4f54-acfc-2232a9837fd1","type":"date","factTableColumn":"YearCode","isSliceDimension":false,"metadata":[{"language":"en-GB","name":"Year"},{"language":"cy-GB","name":"Blwyddyn"}]}],"revisions":[{"id":"445cf38f-e47f-41a2-bbc5-e873523735e7","revision_index":2,"previous_revision_id":"b088280d-70ad-4ccb-a53b-d84131ff8b41","created_at":"2025-09-29T12:54:35.122Z","updated_at":"2026-08-20T16:52:14.381Z","approved_at":"2026-08-20T16:52:14.379Z","publish_at":"2026-08-21T08:30:00.000Z","rounding_applied":false,"update_frequency":{"date":{"day":"","year":"2026","month":"07"},"update_type":"update"},"designation":"accredited","related_links":[{"id":"A6vCv","url":"https://www.gov.wales/mid-year-estimates-population","created_at":"2025-09-24T07:35:12.316Z","label_en":"Mid-year population estimates for Wales bulletin, Welsh Government","label_cy":"Bwletin amcangyfrifon poblogaeth canol-blwyddyn ar gyfer Cymru, Llywodraeth Cymru"},{"id":"Oqliw","url":"https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/bulletins/populationestimatesforenglandandwales/mid2024","created_at":"2025-09-24T07:36:26.940Z","label_en":"Mid-year population estimates bulletin, ONS","label_cy":"Bwletin amcangyfrifon poblogaeth canol blwyddyn, y SYG"},{"id":"19qCE","url":"https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/methodologies/midyearpopulationestimatesqmi","created_at":"2025-09-24T07:36:59.475Z","label_en":"Quality and methodology information, ONS","label_cy":"Gwybodaeth ansawdd a methodoleg, y SYG"},{"id":"spNGt","url":"https://www.nrscotland.gov.uk/publications/mid-2024-population-estimates/#","created_at":"2025-09-24T07:37:18.111Z","label_en":"Mid-year population estimates for Scotland, NRS","label_cy":"Amcangyfrifon poblogaeth canol blwyddyn ar gyfer yr Alban, Cofnodion Cenedlaethol yr Alban"},{"id":"SMQ42","url":"https://www.nisra.gov.uk/statistics/population/mid-year-population-estimates","created_at":"2025-09-24T07:37:33.993Z","label_en":"Mid-year population estimates for Northern Ireland, NISRA","label_cy":"Amcangyfrifon poblogaeth canol blwyddyn ar gyfer Gogledd Iwerddon, \nAsiantaeth Ystadegau ac Ymchwil Gogledd Iwerddon"}]},{"id":"b088280d-70ad-4ccb-a53b-d84131ff8b41","revision_index":1,"previous_revision_id":null,"created_at":"2025-09-17T10:33:21.137Z","updated_at":"2025-09-25T15:50:34.076Z","approved_at":"2025-09-25T15:50:34.073Z","publish_at":"2025-09-25T16:00:00.000Z","rounding_applied":false,"update_frequency":{"date":{"day":"","year":"2026","month":"07"},"update_type":"update"},"designation":"accredited","related_links":[{"id":"A6vCv","url":"https://www.gov.wales/mid-year-estimates-population","created_at":"2025-09-24T07:35:12.316Z","label_en":"Mid-year population estimates for Wales bulletin, Welsh Government","label_cy":"Bwletin amcangyfrifon poblogaeth canol-blwyddyn ar gyfer Cymru, Llywodraeth Cymru"},{"id":"Oqliw","url":"https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/bulletins/populationestimatesforenglandandwales/mid2024","created_at":"2025-09-24T07:36:26.940Z","label_en":"Mid-year population estimates bulletin, ONS","label_cy":"Bwletin amcangyfrifon poblogaeth canol blwyddyn, y SYG"},{"id":"19qCE","url":"https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/methodologies/midyearpopulationestimatesqmi","created_at":"2025-09-24T07:36:59.475Z","label_en":"Quality and Methodology Information, ONS","label_cy":"Gwybodaeth Ansawdd a Methodoleg, y SYG"},{"id":"spNGt","url":"https://www.nrscotland.gov.uk/publications/mid-2024-population-estimates/#","created_at":"2025-09-24T07:37:18.111Z","label_en":"Mid-year population estimates for Scotland, NRS","label_cy":"Amcangyfrifon poblogaeth canol blwyddyn ar gyfer yr Alban, Cofnodion Cenedlaethol yr Alban"},{"id":"SMQ42","url":"https://www.nisra.gov.uk/statistics/population/mid-year-population-estimates","created_at":"2025-09-24T07:37:33.993Z","label_en":"Mid-year population estimates for Northern Ireland, NISRA","label_cy":"Amcangyfrifon poblogaeth canol blwyddyn ar gyfer Gogledd Iwerddon, \nAsiantaeth Ystadegau ac Ymchwil Gogledd Iwerddon"}]}],"published_revision":{"id":"445cf38f-e47f-41a2-bbc5-e873523735e7","revision_index":2,"previous_revision_id":"b088280d-70ad-4ccb-a53b-d84131ff8b41","created_at":"2025-09-29T12:54:35.122Z","updated_at":"2026-08-20T16:52:14.381Z","approved_at":"2026-08-20T16:52:14.379Z","publish_at":"2026-08-21T08:30:00.000Z","metadata":[{"language":"en-GB","title":"Population estimates by local authority, year, sex and age","summary":"This dataset provides population estimates for the local authorities in Wales, the English regions and the UK countries for the period from 1991 onwards by sex and single year of age.\n\nIt should be noted that for mid-2020 there are some definitional changes, particularly affecting the migration components, compared with mid-2019 population estimates data and it is advised users read the Quality and Methodology Information section on the Office for National Statistics website.\n\nFor Wales, England and Northern Ireland, the mid-2021 population estimates are the first population estimates to be based on the 2021 censuses for these countries. For Scotland, the census was moved to 2022. The mid-2022 population estimates are the first population estimates to be based on the 2022 Census for Scotland.\n\nOn 23 November 2023, the data set from 2012 to 2020 for Wales and England were rebased to be consistent with the results of Census 2021. Northern Ireland published rebased 2012 to 2020 data on 29 June 2023. Scotland published rebased 2012 to 2020 data on 9 July 2024.\n\nOn 29 July 2026 estimates for mid-2022, mid-2023 and mid-2024 were revised by the ONS to account for updated estimates of international migration for Wales and England.\n\nInternal migration estimates for mid-2023 have been produced using a different method to previous years, following a change to the variables available in the Higher Education Statistics Agency data.","collection":"The Office for National Statistics (ONS) publish mid-year population estimates for Wales and England as a whole. Further information on how the data are calculated can be found on the ONS' website. A link can be found in the weblink section.","quality":"The Office for National Statistics (ONS) publish mid-year population estimates for Wales and England as a whole. Further information on statistical quality can be found on the ONS' website. A link can be found in the weblink section.","rounding_description":"","reason":"Mid-2025 population estimates have been published for Wales, England and Scotland. Mid-2022, mid-2023 and mid-2024 population estimates have been revised for Wales. The data for England will be revised in this dataset in the next few weeks."},{"language":"cy-GB","title":"Amcangyfrifon poblogaeth yn ôl awdurdod lleol, blwyddyn, rhyw ac oedran","summary":"Mae'r set ddata hon yn rhoi amcangyfrifon poblogaeth ar gyfer awdurdodau lleol Cymru, rhanbarthau Lloegr a gwledydd y Deyrnas Unedig am y cyfnod o 1991 ymlaen, yn ôl rhyw a blwydd oedran. \n\nDylid nodi bod rhai newidiadau yn niffiniadau, yn enwedig yn effeithio ar y cydrannau mudo, ar gyfer canol 2020 o gymharu â data amcangyfrifon poblogaeth canol 2019 a chynghorir bod defnyddwyr yn darllen yr adran Gwybodaeth Ansawdd a Methodoleg ar wefan y Swyddfa Ystadegau Gwladol.\n\nAr gyfer Cymru, Lloegr a Gogledd Iwerddon, amcangyfrifon poblogaeth canol 2021 yw'r amcangyfrifon poblogaeth cyntaf i gael eu seilio ar gyfrifiadau 2021 ar gyfer y gwledydd hyn. Ar gyfer yr Alban, symudwyd y cyfrifiad i 2022. Amcangyfrifon poblogaeth canol 2022 yw'r amcangyfrifon poblogaeth cyntaf i gael eu seilio ar Gyfrifiad 2022 yr Alban.\n\nAr 23 Tachwedd 2023, ailseiliwyd y set ddata o 2012 i 2020 ar gyfer Cymru a Lloegr i fod yn gyson â chanlyniadau Cyfrifiad 2021. Cyhoeddodd Gogledd Iwerddon ddata wedi'u ailseilio ar gyfer 2012 i 2020 ar 29 Mehefin 2023. Cyhoeddodd yr Alban ddata wedi'u ailseilio ar gyfer 2012 i 2020 ar 9 Gorffennaf 2024.\n                                                                                                                                                      \nAr 29 Gorffennaf 2026, diwygiwyd amcangyfrifon ar gyfer canol 2022, canol 2023 a chanol 2024 gan y Swyddfa Ystadegau Gwladol i adlewyrchu amcangyfrifon wedi'u diweddaru o fudo rhyngwladol ar gyfer Cymru a Lloegr.\n\nMae amcangyfrifon mudo mewnol ar gyfer canol 2023 wedi’u cynhyrchu gan ddefnyddio dull gwahanol i flynyddoedd blaenorol, yn dilyn newid i’r newidynnau sydd ar gael yn nata’r Asiantaeth Ystadegau Addysg Uwch.","collection":"Mae'r Swyddfa Ystadegau Gwladol (y SYG) yn cyhoeddi amcangyfrifon poblogaeth canol blwyddyn ar gyfer Cymru a Lloegr gyfan. Mae rhagor o wybodaeth am sut mae'r data'n cael eu cyfrifo ar gael ar wefan y SYG. Mae dolen i'w gweld yn yr adran dolenni gwe.","quality":"Mae'r Swyddfa Ystadegau Gwladol (y SYG) yn cyhoeddi amcangyfrifon poblogaeth canol blwyddyn ar gyfer Cymru a Lloegr gyfan. Mae rhagor o wybodaeth am ansawdd ystadegol ar gael ar wefan y SYG. Gellir dod o hyd i ddolen yn yr adran dolenni gwe.","rounding_description":null,"reason":" Mae amcangyfrifon poblogaeth canol 2025 wedi'u cyhoeddi ar gyfer Cymru, Lloegr a'r Alban. Diwygiwyd amcangyfrifon poblogaeth canol 2022, canol 2023 a chanol 2024 ar gyfer Cymru. Bydd y data ar gyfer Lloegr yn cael eu diwygio yn y set ddata hon yn ystod yr wythnosau nesaf."}],"rounding_applied":false,"update_frequency":{"date":{"day":"","year":"2026","month":"07"},"update_type":"update"},"designation":"accredited","related_links":[{"id":"A6vCv","url":"https://www.gov.wales/mid-year-estimates-population","created_at":"2025-09-24T07:35:12.316Z","label_en":"Mid-year population estimates for Wales bulletin, Welsh Government","label_cy":"Bwletin amcangyfrifon poblogaeth canol-blwyddyn ar gyfer Cymru, Llywodraeth Cymru"},{"id":"Oqliw","url":"https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/bulletins/populationestimatesforenglandandwales/mid2024","created_at":"2025-09-24T07:36:26.940Z","label_en":"Mid-year population estimates bulletin, ONS","label_cy":"Bwletin amcangyfrifon poblogaeth canol blwyddyn, y SYG"},{"id":"19qCE","url":"https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/methodologies/midyearpopulationestimatesqmi","created_at":"2025-09-24T07:36:59.475Z","label_en":"Quality and methodology information, ONS","label_cy":"Gwybodaeth ansawdd a methodoleg, y SYG"},{"id":"spNGt","url":"https://www.nrscotland.gov.uk/publications/mid-2024-population-estimates/#","created_at":"2025-09-24T07:37:18.111Z","label_en":"Mid-year population estimates for Scotland, NRS","label_cy":"Amcangyfrifon poblogaeth canol blwyddyn ar gyfer yr Alban, Cofnodion Cenedlaethol yr Alban"},{"id":"SMQ42","url":"https://www.nisra.gov.uk/statistics/population/mid-year-population-estimates","created_at":"2025-09-24T07:37:33.993Z","label_en":"Mid-year population estimates for Northern Ireland, NISRA","label_cy":"Amcangyfrifon poblogaeth canol blwyddyn ar gyfer Gogledd Iwerddon, \nAsiantaeth Ystadegau ac Ymchwil Gogledd Iwerddon"}],"providers":[{"id":"b8a80696-7135-45f7-adbd-c4b091e3ab28","group_id":"e65ae514-6a8d-4ff0-8a65-4be1bd54a63e","revision_id":"445cf38f-e47f-41a2-bbc5-e873523735e7","language":"en-gb","provider_id":"d3620b5d-be93-44f7-9289-fe3bf50e78f3","provider_name":"Office for National Statistics (ONS)","source_id":"e3ad2503-6e33-445f-93b4-6e0e51767bcc","source_name":"Mid-year population estimates","created_at":"2025-09-29T12:54:35.122Z"},{"id":"0ec97090-4340-45be-9cbb-c5a9eb9b4d7a","group_id":"e65ae514-6a8d-4ff0-8a65-4be1bd54a63e","revision_id":"445cf38f-e47f-41a2-bbc5-e873523735e7","language":"cy-gb","provider_id":"d3620b5d-be93-44f7-9289-fe3bf50e78f3","provider_name":"Y Swyddfa Ystadegau Gwladol (y SYG)","source_id":"e3ad2503-6e33-445f-93b4-6e0e51767bcc","source_name":"Amcangyfrifon poblogaeth canol-blwyddyn","created_at":"2025-09-29T12:54:35.122Z"}],"topics":[{"id":71,"path":"71","name_en":"People, identity and equality","name_cy":"Pobl, hunaniaeth a chydraddoldeb"},{"id":72,"path":"71.72","name_en":"Age","name_cy":"Oedran"},{"id":80,"path":"71.80","name_en":"Population","name_cy":"Poblogaeth"},{"id":83,"path":"71.83","name_en":"Sex","name_cy":"Rhyw"}]},"publisher":{"group":{"id":"b84ab5ab-4ed6-4f1a-9129-63aa60166197","name":"Population And Census","email":"stats.popcensus@gov.wales"},"organisation":{"id":"4ef4facf-c488-4837-a65b-e66d4b525965","name":"Welsh Government"}}}