Tozo is one of ten parishes (administrative divisions) in Caso, a municipality within the province and autonomous community of Asturias, in northern Spain. The population is 75 (INE 2006). ...[Piloña] Tozo is one of 24 parishes (administrative divisions) in Piloña, a municipality within the province and autonomous community of Asturias, in northern Spain. The population is 23. ...