The census of Ireland is typically held on a quinquennial basis by the Central Statistics Office to determine the population of the Republic of Ireland.
Under Article 16 of the Constitution of Ireland, revisions of Dáil constituencies by the Oireachtas are required at a minimum every 12 years.
From 2016, a new census settlement was defined "as a minimum of 50 occupied dwellings, with a maximum distance between any dwelling and the building closest to it of 100 metres, accompanied by evidence of an urban centre".
For the 2022 census, the CSO developed a new urban geography term the Built Up Area (BUA) to define urban areas.
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