Osor is located in the City of Mali Lošinj, in Primorje-Gorski Kotar County at an elevation of 3 meters above sea level and it covers the area of 19.28 km² (7.44 sq. miles). According to the 2011 census report, there were 63 inhabitants. It is mostly populated by Croats (73%), but also Italians (15%) and Serbs (8%). Nearby places: Nerezine, Ustrine, Sveti Jakov, Belej, Punta Križa, Stivan, Ćunski, Miholašćica, Unije and Martinšćica.