The 2020 mid-year estimates of the population for UK countries were published on 25 June 2021 by the Office for National Statistics (ONS).
Cafodd amcangyfrifon canol blwyddyn 2020 o’r boblogaeth ar gyfer gwledydd y DU eu cyhoeddi ar 25 Mehefin 2021 gan y Swyddfa Ystadegau Gwladol (SYG).