Cardiff (12.5%), Newport (8.8%) and Swansea (7.4%) had the highest proportions of people identifying with at least one non-UK identity.
Caerdydd (12.5%), Casnewydd (8.8%) ac Abertawe (7.4%) oedd â'r cyfrannau uchaf o bobl a roddodd o leiaf hunaniaeth heb fod o’r DU.