2.9 million usual residents aged three years and over spoke English or Welsh as their main language (96.7% of the population, down from 97.1% in 2011).
Roedd 2.9 miliwn o breswylwyr arferol tair oed a throsodd yn siarad Cymraeg neu Saesneg fel eu prif iaith (96.7% o'r boblogaeth, i lawr o 97.1% yn 2011).