Northern Ireland Census 2021 - MS-B15: National identity - basic detail

This dataset provides Census 2021 estimates that classify usual residents in Northern Ireland by their national identity (person based). The estimates are as at census day, 21 March 2021. The national identity classification used is an 8-category classification corresponding to selected tick box options on the census questionnaire. This dataset is mutually exclusive; respondents are included in one group only (for example, this classification includes a 'British only' group, 'Irish only' group, and 'British and Irish only' group).

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.