Northern Ireland Census 2021 - MS-E03: Households, household residents and average household size - 1851-2021

This dataset provides census estimates for the number of usual residents living in households in Northern Ireland for the census years 1851 - 2021. It also includes an estimate of the number of households and average household size.

The census collected information on the usually resident population of Northern Ireland on census day (21 March 2021). Initial contact letters or questionnaire packs were delivered to every household and communal establishment, and residents were asked to complete online or return the questionnaire with information as correct on census day. Special arrangements were made to enumerate special groups such as students, members of the Travellers Community, HM Forces personnel etc. The Census Coverage Survey (an independent doorstep survey) followed between 12 May and 29 June 2021 and was used to adjust the census counts for under-enumeration.

The quality assurance report can be found here