Petrovo Selo is located in the City of Dubrovnik, in Dubrovnik-Neretva County at an elevation of 300 meters above sea level and it covers the area of 0.68 km² (0.26 sq. miles). According to the 2011 census report, there were 22 inhabitants. It is entirely populated by Croats. Nearby places: Mokošica, Pobrežje, Sustjepan, Gornje Obuljeno, Donje Obuljeno, Lozica, Nova Mokošica, Čajkovići and Prijevor.