Overall, in 96.2% of households in Wales (1.3 million households), all usual residents said that English or Welsh was their main language, which is a smaller proportion than in 2011 (96.7%,).
Ar y cyfan, yn 96.2% o gartrefi yng Nghymru (1.3 miliwn cartref), dywedodd pob preswylydd arferol mai Cymraeg neu Saesneg oedd eu prif iaith, sy'n gyfran lai nag yn 2011 (96.7%,).