Osunja is located in the City of Samobor, in Zagreb County at an elevation of 500 meters above sea level and it covers the area of 1.68 km² (0.65 sq. miles). According to the 2011 census report, there were only 13 inhabitants. It is predominantly populated by Croats (93%), but also. Nearby places: Cerovica, Novo Selo Žumberačko, Osredek Žumberački, Sječevac, Bratelji, Budinjak, Poklek, Tisovac Žumberački, Dane and Glušinja.