Piarnu (Castrillón)

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 ==


 * 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