School closures between December 2020 and March 2021 due to the coronavirus (COVID-19) pandemic meant that the 2021 census date was delayed to 20 April 2021.
Roedd cau ysgolion rhwng Rhagfyr 2020 a Mawrth 2021 oherwydd y pandemig coronafeirws (COVID-19) yn golygu bod dyddiad cyfrifiad 2021 wedi’i ohirio tan 20 Ebrill 2021.