Sennariolo is a comune (municipality) located about 120 kilometres (75 mi) northwest of Cagliari and about 35 kilometres (22 mi) north of Oristano in the Province of Oristano, Sardinia, Italy. As of 31 December 2004, it had a population of 185 and an area of 15.7 square kilometres (6.1 sq mi).[3]