The Welsh local authority with the lowest proportion of people with a “Welsh” only identity was Flintshire on the border with England (34.7%) by a large margin.
Awdurdod lleol Cymru â'r gyfran isaf o bobl â hunaniaeth “Cymreig” yn unig oedd Sir y Fflint (34.7%) ar y ffin â Lloegr o dipyn i beth.