Buttrio is a comune in the Regional decentralization entity of Udine in the Italian region of Friuli-Venezia Giulia, with a population of 4,050 peop…Buttrio is a comune in the Regional decentralization entity of Udine in the Italian region of Friuli-Venezia Giulia, with a population of 4,050 people, located about 60 kilometres northwest of Trieste and about 10 kilometres southeast of Udine.