Reference materials

Reference materials are designed to help users make the most of census data. They cover various aspects of the census and are intended to support the use of data, including the Census 2021 operational report.

Census 2021 operational report

On 31 January 2022, NISRA published the Census 2021 operational report (PDF 943KB). This document is a factual account of how the census was conducted and sets out a record of key elements associated with the operational delivery.

Census 2021 data processing overview

NISRA has published an overview of the data processing methods for the 2021 Census (PDF 65KB). This document outlines the main stages of data processing for Census 2021.

Census 2021 questionnaires

Sample copies of the Census 2021 questionnaires are available to download.