Donja Perjasica is located in the municipality Barilovići, in Karlovac County at an elevation of 135 meters above sea level and it covers the area of 4.33 km² (1.67 sq. miles). According to the 2011 census report, there were only 14 inhabitants. It is largely populated by Serbs (82%), but also Croats (18%). Nearby places: Ponorac Perjasički, Kestenak, Koranska Strana, Maurovići, Lučica, Marlovac, Štirkovac, Donji Skrad, Perjasica and Ponorac.