Mijači is located in the municipality Brestovac, in Požega-Slavonia County at an elevation of 300 meters above sea level and it covers the area of 7.70 km² (2.97 sq. miles). According to the 2011 census report, there were 18 inhabitants. It is mostly populated by Serbs (70%), but also Croats (30%). Nearby places: Kamenska, Sažije, Kamenski Šeovci, Tisovac, Amatovci, Striježevica, Vranić, Prgomelje, Glavica and Orljavac.