Piarnu (Spanish: Pillarno) is one of eight parishes (administrative divisions) in Castrillón, a municipality within the province and autonomous community of Asturias, in northern Spain.
The population is 791 (INE 2005).
Villages Source: L'Alvarina Buxande La Cangueta El Cascayu La Corredoria El Cuadru La Llaguna La Machuquera Moire Orbón Pipe Pulide La Ramera de Riba Romadoriu La Salguera Teboyas
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