The local authorities with the lowest percentage of Welsh speakers were Blaenau Gwent (6.2%), Newport (7.5%) and Torfaen (8.2%).
Yr awdurdodau lleol â’r canrannau isaf o siaradwyr Cymraeg oedd Blaenau Gwent (6.2%), Casnewydd (7.5%) a Thorfaen (8.2%).