Sennariolo is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about 120 km northwest of Cagliari and about 35 km north of Oristano. As of 31 December 2004, it had a population of 185 and an area of 15.7 km².
Sennariolo borders the following municipalities: Cuglieri, Flussio, Scano di Montiferro, Tresnuraghes.
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- ^ All demographics and other statistics: Italian statistical institute Istat.