As in 2011, the Welsh local authorities with the highest proportion of people who selected Polish as a main language were Wrexham (2.5%) and Merthyr Tydfil (1.9%).
Fel yn 2011, yr awdurdodau lleol yng Nghymru â'r gyfran uchaf o bobl wnaeth ddewis Pwyleg fel prif iaith oedd Wrecsam (2.5%) a Merthyr Tudful (1.9%).