The highest numbers and percentages of people aged three years or older who were reported as being able to speak Welsh are typically seen in parts of north and west of Wales.
At ei gilydd gwelir y niferoedd a'r canrannau uchaf o bobl tair oed neu'n hŷn y nodwyd eu bod yn siarad Cymraeg mewn rhannau o ogledd a gorllewin Cymru.