Census 2021 - There's still time to take part Posted 24.03.2021 Wherever you live in Northern Ireland, it's important that you are counted in the N.Ireland Census 2021. The census happens only once every 10 years and gives us a picture of all the people and households in N.Ireland. Click on the link below and answer the NI Census questions based on your circumstances on Census Day - Sunday 21st March 2021. If you need a new code, you can get a new one online. Complete the Census 2021