The largest increases in the number of people with Polish as a main language since 2011 were observed in Flintshire (up 850 people to 1.4%) and Newport (up 800 people to 1.0%).
Fe welwyd y cynnydd mwyaf yn nifer y bobl a nododd Pwyleg fel eu prif iaith ers 2011 yn Sir y Fflint (cynnydd o 850 o bobl i 1.4%) a Chasnewydd (i fyny 800 o bobl i 1.0%).