The municipality o Piera includes several ootlyin veelages (barris): these are uisually distinguished intae the aulder, tradeetional dounsets (barris antics) an the newer urbanisations which hae been developit tae cope wi the expansion o the municipality (barris nous). Populations are gien for 1999, frae the Ajuntament de Piera an citit in Història de Piera: the toun o Piera (nucli urbà) haed a population o 5036 at that date, whauras the total population o the municipality wis 8551.