卢戈省
In Spain, statistics of the stated that there were 2,703 people with the surname Chao in Galicia, making it the 244th-most-common surname there. The surname could be found in 68 of the 313 municipalities of Galicia. Municipalities with particularly high concentrations of bearers of the surname included Muras (61 people; 2.99% of the local population), Ourol (69; 2.45%), and Pedrafita do Cebreiro (52; 1.72%), all in the Province of Lugo (as were all but one of the ten municipalities with the highest concentrations of bearers of the surname).