Donja Pastuša is located in the City of Petrinja, in Sisak-Moslavina County at an elevation of 125 meters above sea level and it covers the area of 12.15 km² (4.69 sq. miles). According to the 2011 census report, there were only 11 inhabitants. It is entirely populated by Serbs. Nearby places: Jošavica, Gornja Pastuša, Komogovina, Begovići, Tremušnjak, Borojevići, Gornja Mlinoga, Bijelnik, Knezovljani and Blinja.