Sustjepan is located in the City of Dubrovnik, in Dubrovnik-Neretva County at an elevation of 2 meters above sea level and it covers the area of 3.88 km² (1.50 sq. miles). According to the 2011 census report, there were 306 inhabitants. It is largely populated by Croats (83%), but also Serbs (8%) and Bosniaks (7%). Nearby places: Mokošica, Donje Obuljeno, Gornje Obuljeno, Petrovo Selo, Čajkovići, Nova Mokošica, Prijevor, Lozica and Pobrežje.